Pure gold does not occur naturally as rose, white, or green gold. Pure 24k gold is only ever one colour: yellow. Any carat (karat) other than 24K gold (pure gold) is called an alloy. Most other pure metals are grey (gray) or silvery white: gold is yellow. This colour is determined by the density of loosely bound electrons which fall into the visible range for gold and copper but in the ultraviolet range for all other metals. Pure, 24k gold is soft. Alloying it with other metals alters its hardness, ductility, melting point and colour (and other properties). In this article we are interested only in the colour variations that occur when varying weight amounts of other metals are used with gold. Pure gold is yellow in colour. Coloured gold has various hues produced by alloying gold with other elements. Gold is mixed with other metals to produce alloys, simply mixtures of two or more metals.
Read full article here: Gold Colors
No comments:
Post a Comment