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*[[tribochromism]] - colour change caused by [[mechanical]] [[friction]].
*[[piezochromism]] - colour change caused by mechanical [[pressure]].
Classical [[dye]]s and [[pigment]]s produce color by the absorption and reflection of light; these are the materials that make a major impact on the colour of our daily lives. In 2000, world production of [[organic]] dyes was 800,000 tonnes and of organic pigments, 250,000 tonnes. There is also a very large production of [[inorganic]] pigments. Organic dyes are used mainly to colour [[|textile|textile fibres]], [[paper]], [[hair]], [[leather]], while pigments are used largely in [[ink]]s, [[paint]]s and [[plastic]]s.
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Materials may be used to manipulate light via a variety of mechanisms. For instance, a change of orientation of molecules as in [[liquid crystal displays]], by [[interference]] and [[diffraction]] as in [[holography]], and by modifying the movement of light through materials by electrical means, as in [[opto-electronics]], or by optical means in [[photonics]].
Dyes are also made using the properties of chromic substances:
Photochromic dyes
Thermochromic dyes
Source: '''''"Ekram Alam", "Google".'''''
{{chromism}}
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