Acid dyes are primarily classified into three categories:
1.Classification by Dyeing Conditions
Strong Acid Dyes: Require strong acidic conditions (pH 2-4) and are commonly used for wool dyeing.
Weak Acid Dyes: Suitable for use in neutral to weakly acidic environments (pH 4-6) and have a strong affinity for fibers such as silk and nylon.
Neutral Dyes: Used under neutral conditions (pH close to 7), they are suitable for dyeing a variety of fiber blends and have good dispersibility.
2.Classification by Chemical Structure
Azo Dyes: Primarily produce light colors (yellow, orange, red, purple, and blue) and have the largest variety.
Anthraquinones: Primarily produce dark colors (purple, blue, and green) and have the best light fastness.
Triarylmethanes: Produce bright colors (purple, blue, and green) but have the worst light fastness.
3.Typical Applications
Wool, Silk, and Nylon: Strong acid dyes are used for wool dyeing, while weak acid dyes are suitable for silk, nylon, and other fibers.
Leather, paper, metal: Neutral dyes are commonly used for dyeing these materials.
