Abstract
Objective: To synthesize the easily erasable, user-friendly, and low-cost whiteboard ink from the locally available raw sources. Methods: The ink was prepared by mixing the Neem-gum, n-butanol, dyes of different colours in different ratios, and the mixture thus obtained was heated at constant temperature and then was cooled to room temperature and filtered. Findings: Out of different combinations three different ink formulations SH1, SH2, and SH3 were obtained, and later they were tested to different physiochemical analysis. The results thus obtained for SH1, SH2, and SH3 respectively were pH (5.9, 4.7, and 3.4), viscosity (0.0011628 Ns/m2, 0.0086425Ns/m2and 0.0046242Ns/m2) and drying time (5.24 seconds, 18.04 seconds and 8.22 seconds). Samples SH1 and SH3 depict the best properties like drying time, viscosity, and erasability. To know the elemental concentration in the samples, the XRF analysis was conducted and the results thus obtained were on par with that of the standard ink available in the market. Novelty: Ink manufacturers of international repute often synthesize them with chemicals that might harm the users like teachers and other professionals if they come into improper contact with it. So we prepared an ink from the naturally available neem gum which is both user-friendly and eco-friendly. Keywords: Azadirachta indica; erasability; ink; Phenolphthalein; viscosity; XRF analysis
Highlights
Neem! What a tree, nature has provided as a gift for us
Whereas samples SH1, SH2, and SH3 are the ink samples obtained by taking different mixtures
The drying time of samples SH1 and SH3 are closer to standard ink samples than sample SH2; this is due to lower viscosities
Summary
Neem! What a tree, nature has provided as a gift for us. Neems is called ‘arista’ in Sanskrit that reflects as perfect or complete. Nature has provided as a gift for us. Neems is called ‘arista’ in Sanskrit that reflects as perfect or complete. The Gum from Azadirachta indica (neem gum), is tasteless, soluble natural exudates of bright fellow to amber-coloured, material [1,2,3]. Neem gum is used to prepare erasable whiteboard marker ink. Ink can be technically called a colloidal system with fine pigment particles dispersed in a solvent and generally consist of binders, solvents, and additives[4]. In India, it is called masi and using for ages. In the early 19th century, a type of ink known as logwood ink was synthesized from a logwood tree using sodium carbonate and potassium
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