A substance that imparts black or white or a color to other materials

especially : a powdered substance that is mixed with a liquid in which it is relatively insoluble and used especially to impart color to coating materials (such as paints) or to inks, plastics, and rubber.

A pigment will retain a crystal or particulate structure throughout the colouring process.” Ink makes use of pigments and dyes, even though the use of dyes is limited to some kinds of writing, security, and ink jet ink. Most printing inks use pigments for their color efficacy.

PIGMENTS FOR GRAVURE INK

Solvent-based gravure ink

The solvents in such inks are mainly various organic solvents such as benzenes, alcohols, esters, ketones, etc. Different system solvents have different requirements for pigment selection, but in summary, the following should be considered as a whole. point:
1. The viscosity of the gravure ink itself is low, which requires the dispersibility of the pigment to be good. Good fluidity in the binder and no flocculation and precipitation during storage;
2. Due to the printing material, the solvent-based gravure ink is mainly volatile and dry, so it is required to have good solvent release when the system is dry;
3. Solvent resistance is better, no discoloration or fading occurs in the solvent system;
4. In the printing process, it should be in contact with the metal roller. The free acid in the pigment should not corrode the metal cylinder.
5.Alcohol-soluble and ester-soluble inks in solvent-based gravure inks are less toxic to humans. It is the future direction of development.