Complementary colours | Tate https://www.tate.org.uk/art/art-terms/c/complementary-colours
Tate glossary definition for complementary colours: Complementary colours are pairs of colours that contrast with each other more than any other colour, and when placed side-by-side make each other look brighter
Monet Woman Seated on a Bench (c.1874) Tate James Dickson Innes Arenig, North Wales