Intense Blue Color Research Articles

Design, construction and testing of a floating hood biodigester prototype for municipal waste organic waste

This paper documented the design, construction and operation test of a floating hood biodigester prototype, using organic residues (ruminal content, blood, bovine excreta and viscera) from the municipal trail of Ciudad Valles, S.L.P., with the purpose of generating biogas. The components of the biodigester system considered were: loading duct, concrete biodigester tank, biogas pipeline, floating hood, gas reservoir, discharge duct and discharge tank. A biodigester with storage capacity in the 0.178 m3 floating hood was designed for a 30-day trial operation and storage of 0.120 m3 of organic waste mixture in the biodigester tank. As of day 17 of operation the daily average of biogas generated was 0.1801 m3. The composition of the biogas at day 30 of operation, showed a content of 59.4% of CH4. When performing the flame test, an intense blue coloration was obtained, which indicates that the biogas produced has a high calorific value that will allow heating and flammability.

Anthocyanins From Clitoria ternatea Flower: Biosynthesis, Extraction, Stability, Antioxidant Activity, and Applications.

Clitoria ternatea plant is commonly grown as an ornamental plant and possesses great medicinal value. Its flower is edible and also known as blue pea or butterfly pea flower. The unique feature of anthocyanins present in blue pea flowers is the high abundance of polyacylated anthocyanins known as ternatins. Ternatins are polyacylated derivatives of delphinidin 3,3′,5′-triglucoside. This review covers the biosynthesis, extraction, stability, antioxidant activity, and applications of anthocyanins from Clitoria ternatea flower. Hot water extraction of dried or fresh petals of blue pea flower could be employed successfully to extract anthocyanins from blue pea flower for food application. Blue pea flower anthocyanins showed good thermal and storage stability, but less photostability. Blue pea flower anthocyanins also showed an intense blue colour in acidic pH between pH 3.2 to pH 5.2. Blue pea flower anthocyanin extracts demonstrate significant in vitro and cellular antioxidant activities. Blue pea flower anthocyanins could be used as a blue food colourant in acidic and neutral foods. The incorporation of blue pea flower anthocyanins in food increased the functional properties of food such as antioxidant and antimicrobial properties. Blue pea flower anthocyanins have also been used in intelligent packaging. A comparison of blue pea flower anthocyanins with two other natural blue colouring agents used in the food industry, spirulina or phycocyanin and genipin-derived pigments is also covered. Anthocyanins from blue pea flowers are promising natural blue food colouring agent.

Cobalt-willemite and spinel as fractal blue nanopigments based on clinoptilolite zeolite: Synthesis, physical properties, and cool coating application

Blue ceramic nanopigments have been achieved based on the clinoptilolite (CLNP) zeolite. CLNP has been used as a host precursor in conjunction with zinc oxide and cobalt chloride (CoCl2). The process compromised of ion exchange of Co+2 and Zn ions in the cages of zeolite and calcination after the drying process. The colored powders have been characterized by TGA-DTA, XRD, FTIR, surface area measurement (BET, BJH), UV–Vis–NIR, CIE-L∗a∗b∗ color measurements, FE-SEM and EDS. The results show that various intense blue color nanopigments are achieved based on the crystal structures of Co-willemite and spinel of Co-zinc aluminate and cobalt aluminate. The new structures are formed as a result of the heat-induced collapse of the CLNP structure and have the same shape, morphology, and fractal structure as the CLNP. Increased zinc and decreased cobalt content in the composition would be the best conditions for high-intensity peaks pattern and crystalline particle structure with intense blue color. The prepared blue pigment was coated on the surface of the ceramic tile, which showed a high reflectance in the NIR range. This means that the surface coated with the blue pigment can be recognized as a cool coating material.

Intense Blue Chromophores in Cobalt Doped Phenacite‐Type Zinc Germanate System through Jahn‐Teller Distortion of Co Tetrahedron

AbstractIn the quest for new blue chromophores with less usage of cobalt alternatives to the carcinogenic and expensive zinc‐cobalt aluminate system, we developed cobalt doped phenacite type zinc germanate system. Rietveld analysis reveals that the CoO4 tetrahedron intensely experienced Jahn‐Teller distortions leading to irregular geometry on substitution. The UV‐vis‐IR absorption spectra exhibit intense Co2+ d‐d transitions with three fold splitting associated with the CoO4 tetrahedron in the visible and IR region, indicating low symmetry. The crystal field strength 10Dq, Racah parameter and Nephelauxetic ratio variations reflect on the improved covalency of the Co2+ environment. Thus the synergetic effect of Jahn‐Teller distortions and covalency of the CoO4 tetrahedron lead to strong absorptions in the green to red region resulting in intense blue colors with low cobalt content (2.2 to 8.9 mol %). The typical composition Zn1.6Co0.4GeO4 exhibits intense blue hue b*=−58.64, much higher than that of the commercial CoAl2O4 system.

High performance nanozymatic assay-based CuO nanocluster supported by reduced graphene oxide for determination of hydrogen peroxide and ascorbic acid

Several efforts have been made to increase the nanozymatic activity of reduced Graphene Oxide (rGO). Also, the enzyme mimetic research with Nanoclusters (NCs) is in the embryo stage. For the first time, a one pot synthesis method was used successfully for preparation of CuONCs loaded r-GO (CuONCs/rGO). GO and copper sulfate were used as precursors and Bovine Serum Albumin (BSA) as the reducer and stabilizer agent. This nanocomposite possesses intrinsic peroxidase-like activity, which can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine substrate (TMB) by H2O2 to produce an intense blue color in the system. The color change was monitored by absorbance at 650 nm using a UV–vis spectrophotometer. The higher value of Vmax reflected the higher catalytic activity of CuONCs/rGO compared to other similar nanozymes. The increase in the blue color intensity was proportional to the H2O2 concentration in the range of 3.03 × 10−7–5.7 × 10-4 M with a detection limit of 3.03 × 10-7 M. Furthermore, Ascorbic Acid (AA) could reduce the intensity of the blue color in this system. Therefore, AA was determined within the range of 3.0 × 10−7-3.8 × 10-5 M at the detection limit of 3.0 × 10-7 M. The satisfactory results were due to the synergic effect of CuONCs and rGO in the nanocomposite.

Smartphone assisted chromogenic sensing of halogenated solvents and monoaromatic hydrocarbons

Because of the frequent use in industry and commerce, each year million tons of organic solvents have been released to the environment without any prior treatment. Prolonged exposure of the hazardous solvents to humans have already triggered different health issues. As a result, development of off-laboratory and easy-to-handle analytical techniques to detect the harmful solvents are receiving paramount attention. The focus of this article is the development of naked eye observable colorimetric technique for the detection of halogenated solvents and monoaromatic hydrocarbons as well. Two divanadium(V) compounds (probes 1 and 2) were found to show distinct and instant color change to blue when a pinch of the probe is added to a large varieties of colorless solvents of monoaromatic hydrocarbons and halogenated organic compounds as well. The intense blue coloration is presumably due to the ligand-to-metal-charge-transfer (LMCT) and ligand-to-ligand-charge-transfer (LLCT) processes, as concluded from molecular orbital energy level diagrams generated from TD-DFT calculations. Practical applicability of the sensors has been tested by investigating the colorimetric response of the probes in organic solvent mixtures. We also have developed smartphone RGB color value based colorimetric sensing of halogenated and monocyclic aromatic hydrocarbon solvents in various nonpolar organic solvent mixtures, which might be useful for on-site naked eye sensing.

Optimization of Test Placer Composition for Express Colorimetric Determination of Mobile Forms of Phosphorus in Soil and Water Samples

The paper presents the optimized methods of manufacturing test placers for quantitative and visual-blister colorimetric determination of phosphate ion concentration in a blister cell and a test tube. The test placer contains all the reagents for the analytical reaction. Placers allow the quantitative determination of phosphates in various objects without preliminary preparation of reagent solutions. In a blister cell with a diameter of 6 mm, a much more intense blue color was achieved with a solution layer of no more than 2 mm. The application of reagents to the surface of the silica gel allows them to avoid contact until the chemical analytical reaction takes place. The composition of placers and the conditions for applying reagents are improved. Hydrosulfate ions are able to provide a sufficiently high acidity when adding a few drops of the solution. The reaction proceeds in the volume of the added test solution, which is 2–3 drops.

Thiocarbazone‐appended coumarin: An easily accessible ratiometric fluorescent chemosensor for multianalyte (Zn2+ and Cu2+) systems

AbstractA simple thiocarbazone‐appended coumarin derivative 1 with high selectivity as a ratiometric fluorescence sensor towards Cu2+ and Zn2+ in a semi‐aqueous solution was synthesised and characterised. Upon the addition of Cu2+ and Zn2+, the emission of 1 solution undergoes a blue and red shift to 480 and 545 nm according to the intense blue and yellow colour under a 365‐nm ultraviolet lamp, respectively. Binding was confirmed by ultraviolet‐visible absorption analysis, fluorescence measurement, mass spectrometry, proton nuclear magnetic resonance, Fourier Transform‐infrared spectroscopy and density functional theory calculation. The results show that 1 coordinated with Cu2+ and Zn2+ in different modes, resulting in different ratiometric fluorescence responses. The detection limits of the sensor 1 for Cu2+ and Zn2+ were 100.8 and 11.5 nM, respectively. The association constants (Ka) of Cu2+ and Zn2+ with 1 were determined to be 5.59 × 104 and 5.08 × 104 M−1, respectively. Fluorescent microscopy experiments demonstrated that probe 1 has the potential to be used to monitor Zn2+ and Cu2+ in living cells.

Colorimetric determination of phenolic compounds using peroxidase mimics based on biomolecule-free hybrid nanoflowers consisting of graphitic carbon nitride and copper.

Hybrid nanoflowers consisting of graphitic carbon nitride (GCN) and copper were successfully constructed without the involvement of any biomolecule, by simply mixing them at room temperature to induce proper self-assembly to achieve a flower-like morphology. The resulting biomolecule-free GCN-copper hybrid nanoflowers (GCN-Cu NFs) exhibited an apparent peroxidase-mimicking activity, possibly owing to the synergistic effect from the coordination of GCN and copper, as well as their large surface area, which increased the number of catalytic reaction sites. The peroxidase-mimicking GCN-Cu NFs were then employed in the colorimetric determination of selected phenolic compounds hydroquinone (HQ), methylhydroquinone (MHQ), and catechol (CC). For samples without phenolic compounds, GCN-Cu NFs catalyzed the oxidation of the peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2, producing an intense blue color signal. Conversely, in the presence of phenolic compounds, the oxidation of TMB was inhibited, resulting in a significant reduction ofthe color signal. Using this strategy, HQ, MHQ, and CC were selectively and sensitively determined in a linear range up to 100μM with detection limits down to 0.82, 0.27, and 0.36μM, respectively. The practical utility of this assay system was also validated by using it to detect phenolic compounds spiked in tap water, yielding a good recovery of 97.1-108.9% and coefficient of variation below 3.0%, demonstrating the excellent reliability and reproducibility of this strategy. Colorimetric determination of phenolic compounds using peroxidase mimics based on biomolecule-free hybrid nanoflowers consisting of graphitic carbon nitride and copper.

Xylooligosaccharides as an innovative carrier matrix of spray-dried natural blue colorant

Xylooligosaccharides (XOS) are emerging prebiotic carbohydrates with a high potential to promote health and wellness due to their ability to modulate gut microbiota. Their use as a carrier of milk proteins-crosslinked genipin, an innovative natural blue colorant, was examined in this study. Fructooligosaccharides (FOS), a standard prebiotic carbohydrate, and maltodextrin (MD), a standard carrier material, were compared to XOS as wall materials. The effect of the carrier system on the powdered blue colorants was assessed regarding their size, morphology, free-genipin content, blue color intensity, moisture content, water activity, hygroscopicity, water adsorption, and physical structure. Their technological properties as food colorants were evaluated by incorporating in foodstuffs: beijinho, Chantilly, and muffin. XOS exhibited positive effects compared to other carriers evaluated. XOS-based microparticles presented higher free-genipin retention; smaller particle diameter equal to 6.5 ± 0.4 μm, and higher blue color intensity. The microparticles produced with XOS were more hygroscopic compared to other carrier matrices. However, similar to FOS and MD, the blue colorant carried with XOS presented an amorphous structure. XOS was the best carrier in food applications due to the less interference on the blue color in the powder colorant. The XOS microparticles could be easily incorporated into some food matrices. Therefore, spray-dried blue colorant using XOS presented significant innovative potential in many food products, acting as a functional ingredient, replacing artificial blue colors, and incorporating prebiotic properties.

Comparative Transcriptomic Analysis on White and Blue Flowers of Platycodon grandiflorus to Elucidate Genes Involved in the Biosynthesis of Anthocyanins.

Background: Platycodon grandiflorus has long been used in Northeast Asia as a food and folk medicine to treat various diseases. The intense blue color of P. grandiflorus corolla is its characteristic feature.Objectives: By comparing deep transcriptomic data of P. grandiflorus and its white cultivar, we intended to elucidate the molecular mechanisms concerning the biosynthesis of anthocyanins in this plant.Material and Methods: We sampled blue mature flowers (PgB) and yellow young buds (PgY) of P. grandiflorus. Meanwhile, mature flowers (PgW) of P. grandiflorus white cultivar were also collected for RNA extraction and next-generation sequencing. After high-throughput sequencing, Trinity software was applied for de novo assembly and the resultant 49934 unigenes were subjected for expression analysis and annotation against NR, KEGG, UniProt, and Pfam databases.Results: In all, 32.77 Gb raw data were generated and the gene expression profile for the flowers of P. grandiflorus was constructed. Pathway enrichment analysis demonstrated that genes involved in flavone and flavonol biosynthesis were differently expressed.Conclusions: The extremely low expression of flavonoid-3’,5’-hydroxylase in PgY and PgW was regarded as the reason for the formation of its white cultivar. Our findings provided useful information for further studies into the biosynthetic mechanism of anthocyanins.

Photochromic polyoxometalate–based enzyme-free reusable sensors for real-time colorimetric detection of alcohol in sweat and saliva

This study describes a new strategy for real-time detection of alcohol in saliva and sweat. Phosphotungstic acid (PTA) is a colorless, photoelectrochromic heteropoly acid that can be reduced by ethanol under ultraviolet (UV) radiation to produce an intense blue color. This system has useful properties in the development of a new alcohol sensor: (1) the blue color can be detected by the naked eye or mobile camera, even at low ethanol concentrations; (2) color intensity is proportional to ethanol concentration; and (3) once exposed to air, reduced PTA is subsequently oxidized and returns to its colorless state offering sensor reusability. Based on these properties, we developed a simple device consisting of a PTA-impregnated non-woven material and a low-cost UV lamp that can be used to evaluate the alcohol concentration in saliva and sweat. We further enhanced the practical applicability of this sensor by demonstrating the integration of digital image analysis, multivariate analysis, and mobile camera technology with this sensor. This device can be potentially used in vehicles as a convenient, reusable alcohol sensor for drivers.

A Simple Colorimetric Procedure for the Determination of Iodine Value of Vegetable Oils Using a Smartphone Camera

A smartphone camera-based colorimetric method is developed for the determination of iodine value of vegetable oils. The small amount of Wijs reagent is employed for halogenation of the unsaturated sites of the sample. The rest of unreacted reagent is transformed into iodine, which further reacts with the starch solution to form the blue color complex. The free download smartphone application is used for measuring the blue color intensity. More than one sample can be measured by taking only one photo shot. Under the controlled illuminance, the calibration graph for measuring the iodine values of various vegetable oils is constructed from the dissolved triiodide. The detection and quantitation limits are less than 0.02 and 0.032 mM I2, respectively. This method provides a better determination result of the iodine value compared with the standard titrimetric method. This method is convenient, simple, rapid, inexpensive, and easy operation with few chemical waste products.

Study on the synthesis and optical properties of YIn1-xMnxO3 by N/S doping

The solid solution of YIn1-xMnxO3 shows intense blue colors as well as excellent properties. In this paper, N- and N/S- doped YIn1-xMnxO3 samples are successfully prepared by the high-energy ball milling method with hexamethylenetetramine (C6H12N4), urea (CH4N2O) and thiourea (CH4N2S). The X-ray diffraction patterns of samples with various anion doping all show single phase and the oxidation state of Mn are maintained as +3. In C6H12N4 treated YIn0.7Mn0.3O3, N is in the interstitial site while in CH4N2O treated YIn0.7Mn0.3O3, N exists in both interstitial site and substitution site. In CH4N2S treated YIn0.7Mn0.3O3, both S and N are in the substitution site and interstitial site. Due to the anion doping by N and S, the optical properties of the samples are modified and analyzed.

Quantitative E. coli Enzyme Detection in Reporter Hydrogel-Coated Paper Using a Smartphone Camera.

There is a growing demand for rapid and sensitive detection approaches for pathogenic bacteria that can be applied by non-specialists in non-laboratory field settings. Here, the detection of the typical E. coli enzyme β-glucuronidase using a chitosan-based sensing hydrogel-coated paper sensor and the detailed analysis of the reaction kinetics, as detected by a smartphone camera, is reported. The chromogenic reporter unit affords an intense blue color in a two-step reaction, which was analyzed using a modified Michaelis–Menten approach. This generalizable approach can be used to determine the limit of detection and comprises an invaluable tool to characterize the performance of lab-in-a-phone type approaches. For the particular system analyzed, the ratio of reaction rate and equilibrium constants of the enzyme–substrate complex are 0.3 and 0.9 pM−1h−1 for β-glucuronidase in phosphate buffered saline and lysogeny broth, respectively. The minimal degree of substrate conversion for detection of the indigo pigment formed during the reaction is 0.15, while the minimal time required for detection in this particular system is ~2 h at an enzyme concentration of 100 nM. Therefore, this approach is applicable for quantitative lab-in-a-phone based point of care detection systems that are based on enzymatic substrate conversion via bacterial enzymes.

Spray and Aerosolised pH-Neutral Electrochemically Activated Solution Reduces Salmonella Enteritidis and Total Bacterial Load on Egg Surface

The effectiveness of sprayed and aerosolised pH-neutral electrochemically activated solutions (ECAS) containing 150 mg/L of free available chlorine in reducing total bacteria load and artificially inoculated Salmonella enterica serotype Enteritidis 11RX on eggs surfaces was investigated. Treatment groups included untreated control, sodium hypochlorite (positive control), sprayed and aerosolised water and sprayed and aerosolised ECAS. Sprayed ECAS (150 mg/L, 45 s) showed a significant reduction in total bacterial load (2.2 log reduction, p < 0.0001) and S. Enteritidis (5.4 log reduction, p < 0.0001) when compared with the untreated control. Aerosolised ECAS (120 s) was effective in reducing both the total bacterial load (1.4 log reduction, p < 0.01) and S. Enteritidis (4.2 log reduction, p = 0.0022). However, aerosolised ECAS (60 s) only significantly reduced S. Enteritidis counts (2.8 log reduction, p < 0.0008), indicating that a longer time for bacterial reduction during fogging sanitisation is needed. Tests performed with one egg per oscillating tray were more effective in reducing both the total bacterial load and the S. Enteritidis counts than those with three eggs per oscillating tray. Sprayed ECAS (45 s) and aerosolised ECAS (120 s) did not deteriorate the egg cuticle integrity (ΔEab*), which was evaluated using Cuticle Blue dye solution and colour intensity measurement. Overall, both the reduction in total bacteria counts and S. Enteritidis from the egg surface and retention of cuticle integrity suggest that sprayed and aerosolised ECAS could be used as alternative sanitising approaches to improve the food safety aspect of table eggs.

PhenoImage: An open‐source graphical user interface for plant image analysis

AbstractHigh‐throughput genotyping coupled with molecular breeding approaches have dramatically accelerated crop improvement programs. More recently, improved plant phenotyping methods have led to a shift from manual measurements to automated platforms with increased scalability and resolution. Considerable effort has also gone into developing large‐scale downstream processing of the imaging datasets derived from high‐throughput phenotyping (HTP) platforms. However, most available tools require some programming skills. We developed PhenoImage, an open‐source graphical user interface (GUI) based cross‐platform solution for HTP image processing intending to make image analysis accessible to users with either little or no programming skills. The open‐source nature provides the possibility to extend its usability to meet user‐specific requirements. The availability of multiple functions and filtering parameters provides flexibility to analyze images from a wide variety of plant species and platforms. PhenoImage can be run on a personal computer as well as on high‐performance computing clusters. To test the efficacy of the application, we analyzed the LemnaTec Imaging system derived red, green, and blue (RGB) color intensity and plant pigmentation‐based fluorescence shoot images from two plant species: sorghum [Sorghum bicolor (L.) Moench] and wheat (Triticum aestivum L.) differing in their physical attributes. In the study, we discuss the development, implementation, and working of the PhenoImage.

Synthesis and characteristics of aluminate spinel ceramic pigments based on spent aluminium-cobalt-molybdenum catalyst

PurposeThe purpose of this paper is to conduct the directed synthesis of blue-colour aluminate spinel pigments based on spent aluminium–cobalt–molybdenum (ACM) catalyst and to study peculiar features of mineral formation processes and changes in their colour indices depending on composition and firing temperature.Design/methodology/approachAluminate spinel ceramic pigments with specified colour indices were synthesised by directed formation of their mineral composition and identification of the most rational technological parameters of production. Mineral composition of synthesised pigments was evaluated by X-ray phase analysis. The colour indices of pigments and pigment-containing glaze coatings were studied on the comparator colour. The chemical resistance of pigments was determined by loss of their weight loss after boiling in 1 N hydrochloric acid solution and 1 N sodium hydroxide solution.FindingsPeculiar features of formation of the mineral composition of aluminate spinel pigments based on the ACM catalyst were studied. The expediency of using magnesium and zinc oxides in their composition has been proved. It is found that for the formation of stable pigments of intense blue colour, a concentration of cobalt (II) oxide in the amount of 0.5 mol is sufficient, which is 23.1 Wt.%. The colour of such pigments is determined by the ratios of cobalt, magnesium and zinc aluminates, which form a spinel solid solution.Practical implicationsThe use of developed aluminate spinel pigments provides obtaining of high-quality glass coatings of blue colour, in particular, for ceramics.Originality/valueAluminium oxide in the spent ACM catalyst is predominantly in the active form (of amorphous aluminium hydroxide and y-Al2O3). This is a prerequisite for the use of this waste material as a complete substitute for chemically pure Al2O3 in the technology of aluminate spinel pigments and reduction of their firing temperature. Besides, spent ACM catalyst already contains 5 Wt.% of expensive cobalt (II) oxide in the form of stable colour-bearing phase CoAl2O4.

Development of Digital Image Processing as an Innovative Method for Activated Sludge Biomass Quantification

Activated sludge process is the most common method for biological treatment of industrial and municipal wastewater. One of the most important parameters in performance of activated sludge systems is quantitative monitoring of biomass to keep the cell concentration in an optimum range. In this study, a novel method for activated sludge quantification based on image processing and RGB analysis is proposed. According to the results, the intensity of blue color in the macroscopic image of activated sludge culture can be a very accurate index for cell concentration measurement and R2 coefficient, Root Mean Square Error (RMSE), Mean Absolute Error (MAE), and Mean Absolute Percentage Error (MAPE) which are 0.990, 2.000, 0.323, and 13.848, respectively, prove this claim. Besides, in order to avoid the difficulties of working in the three-parameter space of RGB, converting to grayscale space has been applied which can estimate cell concentration with R2 = 0.99. Ultimately, an exponential correlation between RGB values and cell concentrations in lower amounts of biomass has been proposed based on Beer-Lambert law which can estimate activated sludge biomass concentration with R2 = 0.97 based on B index.

A cost-effective intense blue colour inorganic pigment for multifunctional cool roof and anticorrosive coatings

An enormous attention has been paid to cobalt aluminate (CoAl2O4) blue pigments owing to their significant hue of blue colour. Nevertheless, several serious disadvantages, such as high cost due to the high cobalt consumption and poor solar reflectance, are associated with this pigment. Therefore, the development of cost effective and sustainable blue pigments with reduced Co content and improved solar reflectivity is a major focused area in pigment research. Herein, a new series of multifunctional blue coloured inorganic pigments with low cobalt content were prepared via the solid-state method. The structural and spectroscopic evaluations were indicated that the strong blue colour could be generated because of the distorted tetrahedrally organized cobalt chromophore. This structural distortion of the chromophore geometry was linked to the covalency and electron affinity factors. Colour (b* = −59.21) and solar reflectance (R* = 64%) measurements of the optimized composition (NaZn0.9Co0.1PO4) was observed to be superior than the commercially available CoAl2O4 blue pigment. Meanwhile, the optimized pigment loaded epoxy coated steel substrate in marine medium exhibited impressive corrosion resistance properties. The anticorrosive mechanism, further established through the XPS results, validated that the phosphatized inhibitive film served as the barrier for corrosion. The estimated Co content in NaZn0.9Co0.1PO4 was found to be around 10 times lower than the CoAl2O4 blue pigment indicating the cost-effective nature. The optimized pigment was able to retain its optical properties in the prepared acrylic coatings on Al sheet and concrete block. Further, the temperature shielding studies ensured a reduction of ~4 °C in comparison with CoAl2O4 coatings. Therefore, the developed multifunctional blue pigment could be employed for the economic production of blue exterior paint for anticorrosive cool roof coatings.