1. plural of colourer; people or things that apply color or add color to something
Usage: chiefly British spelling; American English typically uses 'colorers'; commonly refers to people who color illustrations, artwork, or other materials
2. substances or agents that impart color; coloring agents
Usage: technical or commercial use

Examples

• The book employed skilled colourers to hand-tint each illustration.
• Professional colourers worked on the animation frames throughout the production.
• Food colourers must meet strict safety regulations before use.
• The textile factory hired additional colourers during the busy season.
• Natural colourers derived from plants are increasingly popular in cosmetics.
• Children's colouring books often come with sets of colourers included.