Color theory primary colors work at all is that the imperfect pigments being used have sloped absorption curves, and thus change color with concentration. A pigment that is pure red at high concentrations can behave more like magenta at low concentrations. This allows it to make purples that would otherwise be impossible. Likewise, a blue that is ultramarine at high concentrations appears cyan at low concentrations, allowing it to be used to mix green. Chromium red pigments can appear orange, and then yellow, as the concentration is reduced. It is even possible to mix very low concentrations of the blue mentioned and
Orange (heraldry) (red) and dots (yellow). A color used for orange in armorials should be distinct from both Gules (red) and Or (yellow), but also from Tenné (light brown) and carnation (flesh-colour). Orange (heraldry) In heraldry, orange is a rarely used tincture except in Catalan, South African, and American Military heraldries. Unless in English heraldry, Orange is not to be confused with tenné ("tanné"), which depicts the color of tanned leather and then slowly became a tincture of its own, along with carnation used for white human skin. Orange didn't receive a hatching pattern during medieval and renaissance times, and first was