Both dyes and pigments are colored because they absorb some wavelengths of light more than others.
Mixing of dyes is a subtractive combination of colors.
Pigment vs Dye
A distinction is usually made between:
- a pigment, which is insoluble in its vehicle (resulting in a suspension),
- and a dye, which either is itself a liquid or is soluble in its vehicle (resulting in a solution).
In contrast to dyes, pigments are insoluble and have no affinity for the substrate.