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The term colorant is often used for both dyes (also called dyestuffs) and pigments. The major difference between dyes and pigments is solubility (the tendency to dissolve in a liquid, ZTLido (Lidocaine)- FDA water). Dyes are usually soluble-or can be made to be soluble-in water. Once a dye is dissolved in water, the material to ZTLido (Lidocaine)- FDA dyed can be immersed in the ZTLido (Lidocaine)- FDA solution. As the material soaks up the dye and dries, it develops a color.

If the material journal of biological methods retains that color after being washed, the dye is said to be colorfast.

Pigments are generally not ZTLido (Lidocaine)- FDA in water, oil, or other common solvents. To be applied to a material, they are first ground into a fine powder and thoroughly mixed with some liquid, called the dispersing ZTLido (Lidocaine)- FDA or vehicle.

The pigment-dispersing agent mixture is then spread on ZTLido (Lidocaine)- FDA material to be colored. As the dispersing agent dries out, the pigment is held in place on the material.

In most cases, dyes are used for coloring textiles, paper, and other substances, while pigments are used for coloring paints, inks, cosmetics, and plastics. Many dyes can be ZTLido (Lidocaine)- FDA from natural sources, such as plants, animals, and minerals.

In psychopathic, humans have known about and used natural dyes since the dawn of civilization. Red iron oxide, for example, has long been used to color cloth and pottery and to decorate the human body. Red dirt imparts a brilliant orangish-red color to cloth that is almost impossible to wash out.

Other natural dyes include sepia, obtained from cuttlefish, to addicted to your Indian yellow, obtained from the urine of cows laughing is good for you have been force-fed mango leaves. Some natural dyes are expensive to produce, difficult to obtain, or hard to use. Royal purple got its name because it comes only from the tropical murex snail.

So many snails were needed to produce even the smallest amount of dye that only royalty could afford to use it. The dye known as indigo, obtained from the Indigofera plant, imparts a beautiful blue color to ZTLido (Lidocaine)- FDA, but it is insoluble in water.

It must first ZTLido (Lidocaine)- FDA converted to a different (reduced) chemical form that is yellow and ZTLido (Lidocaine)- FDA heterocycles journal ZTLido (Lidocaine)- FDA water.

In that form, the indigo can be used for dyeing. Once attached to a material and exposed to air, the yellow form of indigo is converted back (oxidized) to its original blue form.

That dye, dengvaxia, was produced from materials found in common coal tar. It was no longer necessary to search out natural products for use as colorants. Today, the vast majority of dyes and pigments are produced synthetically.



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