These include various metal salts and metal oxides. Minerals provide such dyes as purssian blue, chrome yellow, and iron buff. Tribes and nations in different parts of the world have found out the art of colouring and staining textiles with mineral compounds.
Iron buff: iron springs, containing iron salts in solution are found in many countries with colour sediments left when the water stands exposed to the air. Dipping clothes in these springs and then exposing them to the air dyed them in iron rust colour commonly called as ”iron buff”. Mineral khaki, a mineral colouring matter has been used to dye military uniforms. Today instead of iron scrap, ferrous sulphate is being used.
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