Material	Photochromic materials
	Photochromic materials change reversibly colour with changes in light intensity. Usually, they are colourless in a dark place, and when sunlight or ultraviolet radiation is applied molecular structure of the material changes and it exhibits colour. When the relevant light source is removed the colour disappears. Changes from one colour to another colour are possible mixing photochromic colours with base colours. They are used in paints, inks, and mixed to mould or casting materials for different applications.
Category	Responsive (smart) materials, Colour changing materials
Products	Photochromic T-shirt
References	Detco Enterprise Matsui International, Inc.
Environmen- tal notes	Use: Photochromic compounds pass food container and packaging standards, and producer claims that they do not contain toxic substances.
Photo	Thomas Nissen (Computer graphics)
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