WordNet
colouring material
n. any material used for its color; "she used a different color for the trim" [syn: coloring material, color, colour]
Usage examples of "colouring material".
Arsenic has been used in times past as a food colouring material (such a lovely green), but we suspect that this is not what Lord Downey has in mind.
Chunks of manganese dioxide - a colouring material later used by Cro-Magnon man - have been found in his caves, some of them worn down on one side as if used as crayons.