Human skin darkest brown to the lightest pinkish-white hues. Human skin shows higher variation in color than any other single mammalian species and is the result of natural selection. Skin pigmentation in humans evolved to primarily regulate the amount of ultraviolet radiation (UVR) penetrating the skin, controlling its biochemical effects. The actual skin color of different humans is affected by many substances, although the single most important substance determining human skin color is the pigment melanin. Melanin is produced within the skin in cells called melanocytes and it is the main determinant of the skin color of darker-skinned humans. The skin color
Chinese pigment poisonous or toxic. Outside of these traditional pigments, other colours are made from synthetic chemicals. All traditional yellow pigments are toxic. Because of this, modern synthetic substitutes are often used. In modern practice, painters tend to use white gouache paint as a substitute to traditional whites, typically for underpainting. Chinese pigment Chinese pigments () are the traditional medium to execute traditional Chinese brush paintings, besides ink. Chinese pigments is similar to Western gouache paint in that it contains more glue than watercolours, but more so than gouache. The high glue content makes the pigment bind better to Chinese paper and