Color triangle Color triangle A colour triangle is an arrangement of colours within a triangle, based on the additive combination of three primary colors at its corners. An additive colour space defined by three primary colors has a chromaticity gamut that is a color triangle, when the amounts of the primaries are constrained to be nonnegative. Before the theory of additive color was proposed by Thomas Young and further developed by James Clerk Maxwell and Hermann von Helmholtz, triangles were also used to organize colors, for example around a system of red, yellow, and blue primary colors. After the development of the
Pink triangle of "genocidal" homophobia in slowing progress on medical research, adopted an upward-pointing pink triangle on a black field along with the slogan "SILENCE = DEATH" as its logo. Some use the triangle in this orientation as a specific "reversal" of its usage by the Nazis. The Pink Panthers Movement in Denver, Colorado adopted a pink triangle with clawed panther print logo, adapted from the original Pink Panthers Patrol in New York City. In the 1990s, a pink triangle enclosed in a green circle came to be commonly used as a symbol identifying "safe spaces" for LGBT people at work or