A short illustrated article by D. R. Christie on colour theory as applied to wool textiles. It explains primary, secondary, tertiary and complementary colours, then covers colour mixing in loose wool, self-colour yarns, Scottish tartans and district checks, colour twists, and colour contrasts in woven fabrics. Photographs show a yarn dyer checking shades and slubbing dyeing in large vats, and a collage shows wool blends, a Ferguson tartan and suiting samples.