Color reflected color depends upon the viewing angle. Numerous scientists have carried out research in butterfly wings and beetle shells, including Isaac Newton and Robert Hooke. Since 1942, electron micrography has been used, advancing the development of products that exploit structural color, such as "photonic" cosmetics. Color Color (American English), or colour (Commonwealth English), is the characteristic of human visual perception described through color "categories", with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of cone cells in the human eye by electromagnetic radiation in the visible spectrum. Color categories 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