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Colors used in paints, textiles, books, etc...?

2006-10-27 20:11:50 · 2 answers · asked by Anonymous in Science & Mathematics Chemistry

2 answers

Those colors used are usually from dyes. The dyes were obtained from either animal, vegetable or mineral origin, with no or very little processing. By far the greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood, but only a few have ever been used on a commercial scale.

Dyes are manufactured by natural extraction or/and by Synthetic production.

Example of The Manufacturing Process of Color Indigo:
Natural extraction
1.The chemical found in plant leaves is really indican, a precursor to indigo. In this process, a series of tanks are arranged in a step wise fashion. The upper-most tank is a fermentation vessel into which the freshly cut plants are placed. An enzyme known as indimulsin is added to hydrolyze, or break down, the indican into indoxyl and glucose. During this process carbon dioxide is given off and the broth in the tank turns a murky yellow.
2 After about 14 hours, the resulting liquid is drained into a second tank. Here, the indoxyl-rich mixture is stirred with paddles to mix it with air. This allows the air to oxidize the indoxyl to indigotin, which settles to the bottom of the tank. The upper layer of liquid is siphoned away and the settled pigment is transferred to a third tank where it is heated to stop the fermentation process. The resultant mixture is filtered to remove impurities and dried to form a thick paste.

Synthetic production
3. A variety of synthetic chemical processes have been used to produce indigo. All these processes involve combining a series of chemical reactants under controlled conditions. The reactants undergo a series of reactions which result in the formation of the indigo molecule. A number of other chemical byproducts are also produced in this reaction.
4 These synthesis reactions are conducted in large stainless steel or glass reaction vessels. These vessels are equipped with jackets to allow steam or cold water to flow around the batch as the reactions progress. Because of the complexity of these chemical processes, the dye is usually made in batch quantities.

Decoction are also used as a way of natural extraction. Boiling the resource material is one way of extracting its dye from different colored natural source.♥

2006-10-27 20:39:01 · answer #1 · answered by ♥ lani s 7 · 1 0

Different colours are manufactured by mixing colours together.Eg:-Violet+Indigo+blue+green+yellow+orange+red=White.

2006-10-28 03:21:10 · answer #2 · answered by Gireesh 1 · 0 0

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