Acid Dye

To dye protein fibers such as wool, silk etc, the acid dye is used. And also to dye milk protein fiber which is called Silk Latte, Soy protein fiber called soy silk and also the synthetic polyamide fiber nylon.

Acid dyes are generally classified into three classes based on:

1. Fastness requirements.
2. Economy.
3. Level dyeing properties.
4. Acid dyes have a direct affinity towards protein fiber and polyamide fiber.
5. Many bright shades are found.
6. Some acid dyes have good light fastness.
7. Water soluble.
8. Maximum cellulose fiber can not absorb acid dye.

Trade names of Acid Dye:

Trade Name	Company Name	Country
Acid	BASF	Germany
Lurazol	BASF	Germany
Acid	Bayer	Germany
Acilan	Bayer	Germany
Naphthalene	ICI	U.K.
Solvay	ICI	U.K.
Napthanol	Ciba-Geigy	Switzerland