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An acid dye is a dye that is typically applied to a textile at low pH. They are mainly used to dye wool, not cotton fabrics. [1] Some acid dyes are used as food colorants, [2] [3] and some can also be used to stain organelles in the medical field. Acid dyes are anionic, soluble in water and are essentially applied from acidic bath.
Acid Blue AS Weak Acid Blue Acid Blue 25: 62055 anthraquinone: 6408-78-2: Acid fuchsin: Acid Magenta Acid Rubin Acid Violet 19 42685 triarylmethane: 3244-88-0: Acid orange 3 Acid orange 3 10385 nitro 6373-74-6: Acid orange 19: Acid Orange 19 14690 azo: 3058-98-8: Acid orange 20: Orange I Acid Orange 20 14600 azo 523-44-4: Acid Red 13: Fast red ...
Acid Orange 7, also known as 2-naphthol orange is an azo dye. It is used for dyeing wool. Preparation It is ...
Laccaic acids are mainly used to dye natural fabrics (mostly silk, wool, or cotton) and food, including both drinks and solid products. [4] It is one of the most common natural dyes, but it is less used in cosmetics than carmine, the main natural dye used in this industry. The bright red colorant gives a lightfast tint to silk and wool.
Although almost all dyeing can be done in a vat, the term vat dye is used to describe a chemical class of dyes that are applied to cellulosic fibre (i.e., cotton) using a redox reaction as described below. Because of the use of caustic soda, and the very high pH of the dye bath in the dyeing process, wool cannot be dyed using vat dyestuffs.
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Acid Blue 25 (C 20 H 13 N 2 NaO 5 S) is an acid dye that is water-soluble and anionic and used for adsorption research. [1] The structure is an anthraquinone . [ 2 ]
Substantive dyes work best on textiles with high contents of cellulose, such as cotton. In contrast to direct dyes, wool and leather goods are dyed by the process of ion exchange, exploiting the cationic nature of proteins near neutral pH. The development of substantive dyes helped make mordant dyes obsolete. [2]