Dyes are produced through a series of chemical reactions under highly controlled environments, originally the colour for the dye was extracted from natural substances, as the industry has grown the industry has gone beyond natural extraction and started producing the colours chemically to cope with the vast growth seen in the dye and colour industry. It is used to impart colour to textiles, paper, leather, and other material such that the colouring is not readily altered by washing, heat, light, or other factor to which the material is likely to be exposed.