1. Direct dye

1) It is a dye that can be directly dyed with cotton and hemp without other media.

2) Soluble in water but sensitive to hard water, it must be stained in soft water conditions).

3) In dyeing, Canadian powder or salt can promote dyeing.

2. Reactive dye

1) It is a reactive dye, which can be used to dye cotton and hemp fabrics, and its fastness is better than that of direct dyes.

2) Soluble in water, hydrolyzed and sensitive to hard water (it must be dyed in soft water).

3) Usually, the dye is dyed under neutral condition and fixed under weak alkali condition.

4) The staining can be promoted by Canadian powder or salt.

3. Disperse dye

1) It is a special dye for polyester, and its solubility in water is very small.

2) Only when dyeing, the dye can be dyed by dispersing agent evenly in the dye solution.

3) Disperse dyes are not alkali resistant, and they will decompose and destroy at high temperature and alkaline conditions.

4) Polyester was dyed under weak acid condition.

4. Sulfurized dye

1) It is a sulfur-containing dye, which cannot be dissolved in water directly.

2) When dyeing, the dye can be dyed after it is reduced and dissolved with sulfurization alkali.

3) Salt or powder can promote dyeing in the dyeing process.

4) It is mainly used for dyeing cotton fabrics in deep and thick colors, such as black and dark blue.

5. Cationic dye

1) It can be dissolved in water directly and has positive charge in water solution.

2) Dye acrylic under weak acid condition.

3) In dyeing, the cumin powder can play a role of levelling.

6. Acid dye

1) Soluble in water, with negative charge in water solution.

2) The protein fibers such as wool and silk can be dyed on acid or neutral medium, and nylon can also be dyed.

3) According to the different dyeing properties of dyes, it can be divided into strong acid bath dyeing, weak acid bath dyeing and neutral bath dyeing.