Acid Yellow 59

A: An acid dye is a kind of water soluble dyes. The dye is called an acid dye just because at the very beginning they were used in an acidic bath (often with vinegar or acetic acid.)

A: The yellowish dyes like acid yellow 23, acid yellow 49, acid yellow 59; the orange dyes like acid orange 7, acid orange 116, acid orange 156; the reddish dyes like acid red 336, acid 405, acid red 414; the violet / purple dyes like acid violet 48, acid violet 90; the bluish dyes acid blue 9, acid blue 62, acid blue 260; the greenish dyes like acid green 25, acid green 73; the brownish dyes like acid brown 282, acid brown 283; the black dyes like acid black 172, acid black 194 and so on.

A: Acid dyes are always used in the dyeing and printing of fibers such as wool, silk, nylon and modified acrylic fibers. Acid dyes can also be used in the coloring of leather, paper, inks, cosmetics, feather, wood, fur, soaps, food and so on.

A: Basic dyes are specialized dyes for acrylic fibers and acid dyes are mainly used in the dyeing and printing of fibers like wool, silk, nylon/polyamide and also in the coloring of leather, paper, inks, cosmetics, feather, wood, fur, soaps, food and so on.

A: Most of acid dyes are synthesized from chemical reactions. Azo compounds, anthraquinone or triarylmethane structures' materials are used and combined with water-soluble groups such as sulfonic acid groups and carboxyl groups. Usually condensation, salt precipitation and other steps are involved in forming the finished products.

A: Acid dyes are not toxic although they are called acid dyes. Acid dyes seem to be caustic when you look at the word "acid", but actually they are quite safe.

A: The majority of acid dyes are in the form of aromatic sodium sulfonates which are ionized and bound with amino or amide groups in fibers to set the colors. Acid dyes are suitable for protein fibers such as wool, silk, as well as polyamide synthetic fibers. The acidic media are always used in the dyeing process. According to dyeing performance, acid dyes fall into three dyeing types: strong acid bath, weak acid bath and neutral bath.
Strong acid bath dyes have simple molecular structures with a high proportion of sulfonic acid groups. The fibers are bound by ionic bonds. They exist in the form of anions in the dye bath. Why are they called strong acid dyes? Since the fibers should be dyed in a strong acidic dye bath. This kind of dyes have good levelling performance and bright shade, hence they are also called levelling acid dyes.
Weak acid bath dyes have more complicated molecular structures with a lower proportion of sulfonic groups. The fibers are dyed in a weak acidic dye bath. Normally the wet fastness of weak acid bath dyes is higher than that of strong acid bath dyes, but the levelling performance is not good as that of strong acid batch dyes.
Neutral bath dyes have smaller proportion of sulfonic acid groups in the molecular structures and the fibers are dyed in neutral baths.

A: Acid dyes are not natural. Acid dyes are synthesized from chemical reactions. But people could find some natural colors to dye the fibers.