Orange Color Research Articles

Development of New Hibiscus rosa-sinensis L. Cultivar Acharya Jagadish Chandra Bose D. Chakraborty, J. Swamy & D. Singh in West Bengal, India

Hibiscus has a unique and wide range of colors ranging from brown, purple, white, pink, red, orange, yellow, etc. Many cultivars introduced from various countries were adapted to Indian conditions, of which suitable elegant cultivars Hibiscus rosa- sinensis L. ‘Valentine's Day’ (female pod parent) and Hibiscus rosa- sinensis L. ‘Moorea Memory of July’ (male pollen parent) were selected and hybridized. Hybrid seeds from the female parent were collected, germinated, and grown to the flowering stage. The developed cultivar was named after a great Indian scientist Acharya Jagadish Chandra Bose (H. rosa-sinensis cv. Acharya Jagadish Chandra Bose). A detailed development of the new cultivar with photographs is discussed.

Synthesis, characterization, crystal structure, hirshfeld surface analysis and chromotropic properties of halo- bridged copper(II) complexes

In this study, two novel chromotropic binuclear copper(II) complexes were introduced. The complexes were denoted as [LCu(μ-Cl)Cl]2, 1 and [LCu(μ-Br)Br]2, 2 with L representing the chelating ligand N,N-dimethyl-N'-(9-methylanthracenyl)ethylenediamine. To investigate the structures of these complexes, various analytical techniques were employed, including FT-IR, EPR, UV–Vis spectroscopy, TG-DTA, molar conductivity measurements, and elemental analysis. The geometrical property of [LCu(μ-Br)Br]2 was determined using X-ray crystallography, while the intermolecular interactions were studied through Hirshfeld surface analysis. The characterization data provided strong evidence supporting the proposed binuclear structure, wherein two copper (II) centers are connected by two halogen bridges. Remarkably, these complexes exhibit solvatochromism and thermochromism properties, displaying a diverse range of colors in solutions with varying polarities and/or temperatures. Experimental findings suggest that the observed chromotropism can be attributed to the substitution of solvent molecules with the coordinated halogens in the complexes.

WORKSHOP PENGGUNAAN SARI DAUN PACAR KUKU (Lawsonia inermis L) SEBAGAI PENGGANTI SAFRANIN PADA PEWARNAAN GRAM

Gram staining is one way to differentiate gram-positive bacteria and gram negative bacteria. Gram staining in the laboratory is done with using a solution of gentien violet, iodine, alcohol, and safranin. Leaf henna nail (Lawsonia inermis L) is a plant that produces the reddish yellow molecule is called Lawsone. Additionally leaves henna nails It also contains anthocyanins which produce a reddish orange color. This Community Service aims to inform the audience about the benefits of henna leaf extract (Lawsonia inermis L) is effectively used as a substitute for safranin in gram staining. The results of the workshop show that the audience can understand the benefits of henna nail leaf extract as a substitute for safranin in gram staining, but this is only an alternative.

Taxonomic review of the Calotesversicolor complex (Agamidae, Sauria, Squamata) in China, with description of a new species and subspecies.

Caloteswangisp. nov., a new species of the agamid genus Calotes Cuvier, 1817, from southern China and northern Vietnam, is described. This species can be distinguished from all known congeners by a combination of morphological characteristics and genetic divergence in the mitochondrial tRNA, ND2, and CO1 genes. Molecular phylogenetic analysis revealed that the new species was formed as a monophyletic group and that considerable genetic divergence existed between its congeners (minimum p-distance, 4.6%). Caloteswangisp. nov. is distinguished by a combination of the following characteristics: average SVL < 90 mm for adult males; 10-14 dorsal eyelid scales; scales on side of neck and adjacent shoulder area pointing obliquely upward; keels on neck scales weakly to strongly developed; fold in front of the shoulder absent; pair of dark triangular patches extending from the front of the shoulder to the jaw angles; and orange coloration of the tongue. Caloteswangisp. nov. is similar to C.irawadi but differs in having scales between the nasal shield and the orbit and a fourth toe with a claw that can reach between the eyes and tympanum (even to the snout when hind the limbs are adpressed forward). Phylogenetic analyses revealed two well-supported subspecies, Lineages A and B in C.wangisp. nov., with mean uncorrected p-distances between them of 2%. We propose that Lineage A, which is mainly from the central and southern Wuzhi Mountains on Hainan Island, is a subspecies, C.w.hainanensisssp. nov. Lineage B mainly comprises individuals from other sites on the island plus the adjacent mainland, and is described as subspecies, C.w.wangissp. nov. A diagnostic key to all Calotes species of China is also provided.

REVIEW : KARAKTERISTIK FISIKOKIMIA DAN STABILITAS PIGMEN ANATTO (Bixa orellana L.) SEBAGAI PEWARNA ALAMI PADA PANGAN

Anatto plant (Bixa orellana L.) is a plant that contains two types of pigments, namely bixin and norboxin. Bixin is the main pigment in kesumba fruit which is non-polar, while norbixin is polar. The utilization of anatto pigment have the potential to serve as a natural coloring agent for food. The physicochemical characteristics of annatto pigments are related to size, shape, boiling point, melting point, solubility, constituent compounds, bonds between atoms, polarity, and chemical reactions. Kesumba seeds can produce annatto pigments through an extraction process. Annatto extraction produces a yellowish orange color obtained from the outer layer of the seeds of the kesumba plant. The method used in the bixin extraction process is the maceration method by soaking the kesumba seeds in a mixture of organic solvents that match the polarity properties of bixin or norbixin pigments. Annatto seed powder has a greater attachment to oil than attachment to water, annatto seed powder has a relatively higher OHC than WHC. The melting point of bixin is 195°C and its boiling point is 280°C while the boiling point of norbixin ranges from 287-289°C and its melting point ranges from 169-170°C. The application of anatto pigment is used in commercial cheese products, cassava crackers, karag crackers, and pork patties. Besides functioning as a colorant, bixin extract can be to supply antioxidants due to its composition containing cartenoids.

Critical understanding on excitation-dependent multicolor emission from Eu3+ and Tb3+ co-doped SrF2

Generating multicolor photoluminescence including white light from the same phosphor is advantageous while often a challenging task. Herein, a detailed study on excitation-dependent tunable photoluminescence characteristics in Eu3+ and Tb3+ co-doped SrF2 phosphor has been carried out. This phosphor yields lights of various colors including red, orange, and near white due to the change of the relative intensity of the blue, green, orange, and red color transitions of Eu3+ and Tb3+ ions. As revealed from DFT-based theoretical calculation, the existence of various mid-gap states created by the p orbitals of F- and f and d orbitals of Eu3+ and Tb3+ ions inside the wide band gap SrF2 host is responsible for the existence of multiple excitation peaks. The intensity of these excitation peaks is fully governed by the relative occupancy of these mid-gap states. This study helps future design of single phase multicolor emitting phosphor based lighting devices.

Expansion of chromatic color range and improvement of mechanical properties on Cu–Ge supersaturated solid solution alloys

The Cu–Ge solid solution alloys have a limited color range and relatively low strength due to its limitation of Ge solubility for a solid solution α-Cu phase at room temperature. To extend chromatic color range and to improve mechanical properties of Cu–Ge solid solution alloys, the Cu–Ge alloys with relatively higher Ge content than solubility limit on equilibrium state were fabricated by induction casting. The as-cast Cu–Ge alloys with 7–10 at.%Ge exhibited dual-phase structure composed of α-Cu and ζ-Cu17Ge3 phases with dendritic structure. By annealing at 700 °C for various times and followed quenching processing, the alloys successfully transformed into the supersaturated α-Cu single-phase structure. To confirm the color difference between the supersaturated single α-phase alloys with a high Ge content and the as-cast single α-phase alloys with low Ge content, the reflectivity analysis, CIE L*a*b* color space system, and color difference indicator were used. As a result, it was confirmed that there was a distinct color difference between supersaturated single α-phase alloys and as-cast single α-phase alloys, and the reflectivity and color difference of the alloys significantly depended on Ge content. Moreover, the Vickers hardness of as-cast and solution treated single α-phase alloys highly improved with an increase of Ge content. The influence of Ge content on phase formation, chromaticity and mechanical properties of solid solution Cu–Ge alloys was systematically discussed.

Detection of petal colour QTLs in RILs of safflower

The present study aimed to determine the QTL monitoring petal colour in F9 and F10 RILs derived from CO-1/EC-523368-2 safflower. Yellow, red and orange colours were observed in the population. QTL analysis determined five and three QTLs in F9 and F10 RILs respectively with 25.1 % as the highest phenotypic variance explained.

Co-modulation of structural and pigmentary coloration in Lyropteryx apollonia butterfly.

Nature produces some of the most striking optical effects through the combination of structural and chemical principles to give rise to a wide range of colors. However, creating non-spectral colors that extend beyond the color spectrum is a challenging task, as it requires meeting the requirements of both structural and pigmentary coloration. In this study, we investigate the magenta non-spectral color found in the scales of the ventral spots of the Lyropteryx apollonia butterfly. By employing correlated optical and electron microscopy, as well as pigment extraction techniques, we reveal how this color arises from the co-modulation of pigmentary and structural coloration. Specifically, the angle-dependent blue coloration results from the interference of visible light with chitin-based nanostructures, while the diffused red coloration is generated by an ommochrome pigment. The ability to produce such highly conspicuous non-spectral colors provides insights for the development of hierarchical structures with precise control over their optical response. These structures can be used to create hierarchically-arranged systems with a broadened color palette.

Investigation of yellowing perception: comparison of “whitish,” “yellowish,” “yellowing,” “yellowed,” “aged” and “dirty” colors

Perceptions of yellowing, aging and dirtiness in textile products affect consumer satisfaction and sustainable use. Customers often decide whether to use a product based on its color, even if it is functionally usable. It is difficult to avoid the yellowing of objects; consequently, many scales have been developed to evaluate this phenomenon. This study examined consumers' perceptions of various colors associated with yellowing, aging and dirtiness using the terms “whitish,” “yellowish,” “yellowing,” “yellowed,” “aged” and “dirty,” and the differences between them. The applicability of the commonly used yellowness index (YI) was also examined. The results showed perceptual similarities among “yellowish,” “yellowing” and “yellowed,” but there were also notable differences. The boundary between “whitish” and “yellowish” was clear, but near-white colors were included for “yellowing” and “yellowed” colors. The yellow component was a major factor in “aged” and “dirty,” but not the only characteristic. Similarities and differences between “aged” and “dirty” perceptions were demonstrated. The “aged” colors were distributed in a wider range than the “dirty” colors, and most of the “dirty” colors were within the “aged” color range. This suggests that even colors perceived as “aged” are not necessarily “dirty.” The YI did not adequately assess the perceptions. Consumers' perceptions of colors ranged more widely than those of the YI. As the need for sustainability and creating products that meet consumers' needs for long-term use continues to grow, it would be valuable to understand not only yellow-associated colors but also “aged” and “dirty” and their differences.

Detecting Photovoltaic Panels in Aerial Images by Means of Characterising Colours

The detection of photovoltaic panels from images is an important field, as it leverages the possibility of forecasting and planning green energy production by assessing the level of energy autonomy for communities. Many existing approaches for detecting photovoltaic panels are based on machine learning; however, they require large annotated datasets and extensive training, and the results are not always accurate or explainable. This paper proposes an automatic approach that can detect photovoltaic panels conforming to a properly formed significant range of colours extracted according to the given conditions of light exposure in the analysed images. The significant range of colours was automatically formed from an annotated dataset of images, and consisted of the most frequent panel colours differing from the colours of surrounding parts. Such colours were then used to detect panels in other images by analysing panel colours and reckoning the pixel density and comparable levels of light. The results produced by our approach were more precise than others in the previous literature, as our tool accurately reveals the contours of panels notwithstanding their shape or the colours of surrounding objects and the environment.

Making waves: The sensitivity of lakes to brownification and issues of concern in ecological status assessment

Brownification or increasing water colour is a common problem in aquatic ecosystems. It affects both physico-chemical properties and biotic communities of the impacted waters. A common view is that lakes having low background water colour are most sensitive to brownification. In this article, we show that although low-colour and high-colour lakes respond differently to brownification, the effects on biotic communities can be strong irrespective of water colour. For phytoplankton production, the effect of brownification can be positive at low colour and negative at high colour, the relative effect being strongest at high colour. For fish foraging, the disturbance per increasing unit of colour may also be highest at high-colour conditions. Additionally, the presently used classification systems mostly describe the effects of eutrophication and do not account for the effects of brownification. Studies on the whole colour range of lakes are needed and indicators used in the ecological status assessment of lakes must be developed to reveal the effects of brownification. Indicators distinguishing the effects of brownification from those of eutrophication are especially needed.

Vivid Colored Cooling Structure Managing Full Solar Spectrum via Near-Infrared Reflection and Photoluminescence.

Colored radiative cooling (CRC) offers an attractive alternative for surface and space cooling, while preserving the aesthetics of an object. However, there has been no study on the CRC using phosphors in regard to vivid coloration, sophisticated performance investigation, retention of properties, functionality, and structural flexibility all at once. Thus, to manage the entire solar spectrum, a colored cooling structure comprising a near-infrared (NIR)-reflective bottom layer and a top colored layer with a phosphor-embedded polymer matrix is proposed. The structure is paintable, vividly colored, hydrophobic, and ultraviolet (UV) and water resistant. In the daytime outdoor measurement, the structure with red, orange, and yellow colors exhibited lower temperature than a control group using commercial white paint by 4.7 °C, 7.2 °C, and 7.4 °C, respectively. After precise theoretical and experimental time-tracing temperature validation, the CRC performance enhancement from NIR reflection and photoluminescence effects was thoroughly analyzed, and a temperature reduction of up to 16.1 °C was achieved for the orange-colored structure. Furthermore, experiments of hydrophobicity infusion and exposure to UV and deionized water verified the durability of the colored cooling structure. In addition, flexible-film-type colored cooling structures were demonstrated using different bottom reflective layers, such as a silver thin film and porous aluminum oxide particle-embedded poly(vinylidene fluoride-co-hexafluoropropylene), suggesting the potential applicability of these colored cooling structures for vivid-colored, functional, and durable CRC.

Collection of representatives of the Ericaceae family in the botanical garden of the Kuzbass Humanitarian Pedagogical Institute

Representatives of the heather family are distributed in the temperate climate zone almost throughout the globe and are of great economic importance. The collection of representatives of the Ericaceae family in the Botanical Garden of the Kuzbass Humanitarian Pedagogical Institute of the Federal State Budgetary Educational Institution of Higher Education “Kemerovo State University” consists of 12 species and 28 varieties belonging to 7 genera. Representatives of the genus Rhododendron are represented by 10 species and 7 hybrid varieties. These are predominantly evergreen, semi-deciduous or deciduous shrubs. The collection also includes 11 varieties of common heather with a wide range of flower and leaf colors. Also, in the conditions of the Botanical Garden of KSPI, the varieties Erica carnea L. (ruddy or herbaceous Erica) performed well. Among other representatives of the Heather family, the collection includes 3 species of Kalmia, 2 varieties of Empetrum nigrum L., 2 varieties of Andromeda polifolia L. and Vaccinium myrtillus L. (common blueberry). The experience of relatively successful cultivation of representatives of the heather family allows us to hope for expanding the taxonomic and quantitative composition of the collection, which is actively used for scientific and educational purposes.

Mock Observations: Formation and Evolution of Diffuse Light in Galaxy Groups and Clusters in the IllustrisTNG Simulations

In this paper, by analyzing mock images from the IllustrisTNG100-1 simulation, we examine the properties of diffuse light and compare them to those of central and satellite galaxies. Our findings suggest that the majority of the diffuse light originates from satellites. This claim is supported by the similarity between the age and metallicity distributions of the diffuse light and those of the satellites. Notably, the color distribution of the diffuse light gradually evolves to resemble that of the centrals at lower redshifts, suggesting a coevolution or passive process. The radial profiles of the diffuse light reveal distinct trends, with the inner regions displaying a relatively flat distribution and the outer regions showing a descending pattern. This finding suggests that the formation of the diffuse light is influenced by both major mergers and stellar tidal stripping. Moreover, strong correlations are found between the stellar mass of the diffuse light and the overall stellar mass of the satellites, as well as between the stellar mass of the diffuse light and the number of satellites within groups or clusters. These relationships can be described by power-law and logarithmic functions. Overall, the diffuse light components predominantly originate from satellites with intermediate ages and metallicities. These satellites typically fall within the stellar mass range and the color range −1 < [g − r]0.1 < 0. As the redshift decreases, the growth of the diffuse light is primarily influenced by the redder satellites, while the most massive and reddest satellites have minimal roles in its growth.

Genetic modification of a Hox locus drives mimetic color pattern variation in a highly polymorphic bumble bee.

Müllerian mimicry provides natural replicates ideal for exploring mechanisms underlying adaptive phenotypic divergence and convergence, yet the genetic mechanisms underlying mimetic variation remains largely unknown. The current study investigates the genetic basis of mimetic color pattern variation in a highly polymorphic bumble bee, Bombus breviceps (Hymenoptera, Apidae). In South Asia, this species and multiple comimetic species converge onto local Müllerian mimicry patterns by shifting the abdominal setal color from orange to black. Genetic crossing between the orange and black phenotypes suggested the color dimorphism being controlled by a single Mendelian locus, with the orange allele being dominant over black. Genome-wide association suggests that a locus at the intergenic region between two abdominal fate-determining Hox genes, abd-A and Abd-B is associated with the color change. This locus is therefore in the same intergenic region but not the same exact locus as found to drive red-black mid-abdominal variation in a distantly related bumble bee species, B. melanopygus. Gene expression analysis and RNA interferences suggest that differential expression of an intergenic long non-coding RNA between abd-A and Abd-B at the onset setal color differentiation may drive the orange black color variation by causing a homeotic shift late in development. Analysis of this same color locus in comimetic species reveals no sequence association with the same color shift, suggesting that mimetic convergence is achieved through distinct genetic routes. Our study establishes Hox regions as genomic hotspots for color pattern evolution in bumble bees, and demonstrates how pleiotropic developmental loci can drive adaptive radiations in nature.

Can orange colour facilitate the processing of happiness? An exploration study on happiness metaphor.

Colour is a ubiquitous perceptual stimulus, and theoretical models of colour and psychological functioning posit that colour plays a key role in influencing the behaviour and mental function of a person. One investigation and two experiments investigated the colour metaphor representation of happiness concepts and the mapping mode of the colour metaphor of happiness concepts. A questionnaire was conducted to explore the relationship between colour preference and happiness. Study 2 shows that the identification of happiness words was facilitated more when words were viewed on an orange background than when viewed on a blue background. Study 3 further verifies the links of the connection between colour and happiness at the sentence level, and the orange-happiness facilitation effect was replicated. These results document a novel influence of colour on emotion recognition processes, where an orange background may facilitate the processing of the concept of happiness and provide support for conceptual metaphor theory and colour-in-context theory.

2782. In vitro activity of ceftazidime-avibactam against Gram-negative strains in patients with bacteremia and skin and soft-tissue infections in Colombia 2019-2021

Abstract Background In vitro activity of Ceftazidime-avibactam (CAZ-AVI) in patients with bacteremia and skin and soft tissue infections (SSTIs) is unknown. The study aimed to analyze the in vitro antimicrobial activity of CAZ-AVI and other antimicrobials against Gram-negative bacilli collected in hospitals in Colombia in patients with bacteremia and SSTIs. Methods Enterobacterales and P. aeruginosa from patients with bacteremia and SSTIs were analyzed. Strains were collected from four ATLAS-reporting hospitals in Colombia between 2019 and 2021. Results Enterobacterales: A total of 600 Enterobacterales were collected. The most susceptible antimicrobials to Enterobacterales were CAZ-AVI (96.5%), tigecycline (95%), and amikacin (92.17%). The incidence of carbapenem-resistant Enterobacterales (CRE) was 13.5% (n= 81), and the antimicrobials with the best activity were tigecycline (93.83%), CAZ-AVI (74.07%), and amikacin (50.62%) (Figure 1). Tigecycline, CAZ-AVI, and amikacin were the antimicrobials with the best in vitro activity against MDR Enterobacterales, extended-spectrum β-lactamase-producing (ESBL) Enterobacterales, and KPC-producing Enterobacterales (Figure 2). K. pneumoniae (n= 198), E. coli (n= 167), Enterobacter cloacae (n= 46), and Serratia marcescens (n= 41) were the strains most frequently isolated (Table 1). Tigecycline and CAZ-AVI had excellent in vitro activity against all four species, as well as for those ESBL-producers, MDR, and carbapenem-resistant (CR). P. aerugniosa: A total of 259 P. aeruginosa were analyzed. CAZ-AVI was the antimicrobial with the best in vitro activity against P. aeruginosa with a susceptibility of 83.4%, as well as against CR (S= 44%), MDR (S= 50.58%), and DTR Pseudomonas (S= 33.33%). Figure 1 Antimicrobial activity among isolates of Enterobacterales and Carbapenem-resistant Enterobacterales (CRE) collected in Colombia between 2019 - 2021 S: susceptible; NS: Not susceptible; Pip/taz: Piperacillin-tazobactam; CZA: Ceftazidime-Avibactam; S: susceptible; NS: Not susceptible; CRE: Carbapenem-resistant Enterobacterales Figura 2 Not susceptibility among isolates of Extended-spectrum β-lactamase Enterobacterales, Multidrug-resistant Enterobacterales, Klebsiella pneumoniae carbapenemase (KPC)-producing enterobacterales, and metallo β-lactamase producing enterobacterales in Colombia A. Not susceptibility among isolates of Extended-spectrum β-lactamase enterobacterales (green color) and Multidrug-resistant Enterobacterales (orange color) B. Not susceptibility among Klebsiella pneumoniae carbapenemase (KPC)-producing enterobacterales (green color) and metallo β-lactamase producing enterobacterales (orange color) Pip/taz: Piperacillin-tazobactam; CZA: Ceftazidime-Avibactam; MDR: Multidrug-resistant Conclusion Tigecycline and CAZ-AVI were the two antimicrobials with excellent in vitro activity against clinical specimens from patients with bacteremia and SSTIs caused by CRE, MDR Enterobacterales, and ESBL- and KPC-producing Enterobacterales. Against MDR, CR, and DTR P. aeruginosa, CAZ-AVI and amikacin were the antimicrobials with the best in vitro activity (Figure 3). Disclosures Elkin Lemos-Luengas, MD MSc PhD, Pfizer Colombia: Honoraria Sixta Romelia Rentería-Valoyes, Md, Pfizer: Senior Associate Medicines Business /Medical Scientific Liaison MD for Pfizer Colombia Diana Marcela Almario Muñoz, MD, MSc, Pfizer Colombia: Medical Scientific Liaison Carlos David Gamboa Orozco, Md, Pfizer: Medical Scientific Liaison for Pfizer Colombia Juan Camilo Olivella Gómez, n/a, Pfizer Colombia: Medical Student Jorge Ramos-Castaneda, PhD, Pfizer: Advisor/Consultant

User preferences and consumer acceptability of boiled plantain in rural and urban localities in Cameroon.

An understanding of the preferences of different stakeholders in the plantain value chain in rural and urban segments in Cameroon is important for the selection and adoption of new plantain cultivars. Boiled plantain is one of the most commonly consumed food products from this crop in Cameroon. Gendered food mapping and consumer testing with two plantain landraces (Batard and Big Ebanga) and a plantain-like hybrid (CARBAP K74) was carried out in rural and urban areas in the West and Littoral regions of Cameroon. Plantain users in these two regions were categorized into producers, traders, processors, and consumers. Preferences indicated that raw plantain should bear long and large fruits, with heavy bunches, and an orange pulp color, whereas boiled plantain should present with a yellow color and a soft and mealy pulp, with a good plantain aroma. Batard and Big Ebanga were liked moderately by consumers, whereas CARBAP K74 was liked slightly. CARBAP K74 was on par with Batard and Big Ebanga for some attributes, except for color and sweetness. More emphasis should be given to attributes such as color, firmness, and taste for the development of new plantain clones to be adopted by end users consuming boiled green plantain. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Thermochromic Printable and Multicolor Polymeric Composite Based on Hybrid Organic-Inorganic Perovskite.

Hybrid organic-inorganic perovskites (PVKs) are among the most promising materials for optoelectronic applications thanks to their outstanding photophysical properties and easy synthesis. Herein, a new PVK-based thermochromic composite is demonstrated. It can reversibly switch from a transparent state (transmittance > 80%) at room temperature to a colored state (transmittance < 10%) at high temperature, with very fast kinetics, taking only a few seconds to go from the bleached to the colored state (and vice versa). X-ray diffraction, Fourier-transform infrared spectroscopy, differential scanning calometry, rheological, and optical measurements carried out during heating/cooling cycles reveal that thermochromism in the material is based on a reversible process of PVK disassembly/assembly mediated by intercalating polymeric chains, through the formation and breaking of hydrogen bonds between polymer and perovskite. Therefore, differently from other thermochromic perovskites, that generally work with the adsorption/desorption of volatile molecules, the system is able to perform several heating/cooling cycles regardless of environmental conditions. The color and transition temperature (from 70 to 120°C) can be tuned depending on the type of perovskite. Moreover, this thermochromic material is printable and can be deposited by cheap techniques, paving the way for a new class of smart coatings with an unprecedented range of colors.