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 (colour) orange is named after the appearance of the ripe orange fruit. The word comes from the Old French "orange", from the old term for the fruit, "pomme d'orange". The French word, in turn, comes from the Italian "arancia", based on Arabic "nāranj", derived from the Sanskrit "naranga". The first recorded use of "orange" as a colour name in English was in 1512, in a will now filed with the Public Record Office. Prior to this word being introduced to the English-speaking world, "saffron" already existed in the English language. "Crog" also referred to the saffron colour, so that orange was