Original Source: http://visual.ly/making-formula-colourful-gold
Fantastic formula of colourful gold cover the metal mix up percentage to make it sparkling and colourful. Coloured gold is used in jewellery and there are many jewellery brands use rose, pink, red gold in their collection. There are many white metals and other metals like copper, manganese, aluminum, Indium, zinc are used for make the gold colourful.