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By E. Perrin Akçakoca Kumbasar

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Fleischer, K. W. & Salesin, D. H. (1997). Computer-generated watercolor, Computer Graphics 31(Annual Conference Series): 421–430. htm Fick, A. (1855). On liquid diffusion, Jour. Sci. 10: 31–39. Kunii, T. , Nosovskij, G. V. & Vecherinin, V. L. (2001). Two-dimensional diffusion model for diffuse ink painting, Int. J. of Shape Modeling 7(1): 45–58. Langmuir, I. (1916). The constitution and fundamental properties of solids and liquids. part i. , Journal of the American Chemical Society 38: 2221–2295.

Some of its constituents are anti-allergens, hence prove safe for skin contact and are mostly non-hazardous to human health. x. Some of the natural dyes are enhanced with age, while synthetic dyes fade with time. xi. Natural dyes bleed but do not stain other fabrics, turmeric being an exception. xii. Natural dyes are usually moth proof and can replace synthetic dyes in kids garments and food-stuffs for safety. Despite these advantages, natural dyes do carry some inherent disadvantages, which are responsible for the decline of this ancient art of dyeing textiles.

Iii. Alphanaphthoquinones: Typical example of this class is lawsone (henna), cultivated mainly in India and Egypt. Another similar dye is juglone, obtained from the shells of unripe walnuts. These dyes are generally disperse dyes and give shades of orange. iv. Flavonoids, which yield yellow dyes can be classified under flavones, isoflavones, aurones and chalcones. Flavones are colourless organic compounds. Most of the natural yellows are derivatives of hydroxyl and methoxy substituted flavones and isoflavones.

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