Colourant

A colourant (British spelling) or colorant (American spelling) is something added to something else to cause a change in colour. Colourants can be:

Dyes
Pigments
Biological pigments
Inks
Paint
Coloured chemicals
Food colourings

For example, colourants could be adding white to tint a paint, or black to shade a paint, ultimately changing the colour or value.

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