By Sunil Bhardwaj

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1. Lakes of Acid dyes: These are the salts of the dyes in which sodium ion is replaced by heavy metal ion like Ca or Ba etc. the dye will react with inorganic salt and form ppt. This ppt is the pigment.

Azo dye
Azo dye

2. Lakes of basic dyes: These are pigments precipitated by replacing anion by tannic acid or tungstic acid etc. They are used in paints and printing inks.

Pigment violet - I
Pigment violet - I

3. Mono-azo pigments: They are used as yellow pigments. These pigments are used for paints and printing inks.

Hansa Yellow. G.
Hansa Yellow. G.
Pigment Red - 2
Pigment Red - 2

4. Diazo Pigments: E.g. nickel azo yellow It is used in the mass colouration of rubber.

Diazo Pigment
Diazo Pigment

5. Azomethine pigments: They have very good and light fastness. ist Their general formulae is

Azomethine pigment
Azomethine pigment

6. Thio indigo pigments: They have brilliant shades. They are used in printing inks, paints, enamels etc mis They are used for the mass colouration of plastic and viscose rayon.

Thio indigo pigment
Thio indigo pigment

7. Anthraquinone: They are actually vat dyes. E.g. Indianthrone Blue BC

Anthraquinone
Anthraquinone

8. Quinacridone pigments: Their colour and shades depends physical form. A, B, X... Form. (eta) And x forms are mainly used as they have good general fastness properties.

Quinacridone
Quinacridone

9. Phthalocyanine: They have the brilliant shades. Excellent light and neat fastness. It has blue colour.

Copper phthalocyanine
Copper phthalocyanine

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