A water-soluble pigment produced by the action of a precipitant with water-soluble dyes, such as acid, direct, or basic dyes.
Its color is more brilliant, chromatogram is more complete, production cost is low, than the original water-soluble dye fastness to the sun.
The precipitants are mainly inorganic salts, acids, carriers and so on.
Inorganic salt precipitation is the reaction between barium chloride, calcium chloride, manganese sulfate and other water-soluble dyes to produce water-insoluble barium, calcium, manganese and other salts such as permanent red F5R(C.I.
Pigment red 48:2), golden red C(C.I. pigment red 53:1).
Acid precipitation USES phosphoric acid molybdic acid, phosphotungstic acid, tannic acid and other as precipitants to react with water-soluble basic dyes to produce insoluble lakes such as sunfast rose lake (C.I).
Pigment violet 1), pigment violet 3 (C.I. pigment violet 3).
Carrier precipitation is the deposition of water-soluble dyes on the surface of carriers such as aluminum hydroxide and barium sulfate to form water-insoluble lakes such as acidic golden lake (C.I).
Pigment orange 17), fast sun lake Blue Lake (C.I. pigment blue 17).