Thermochromic Dyeing - heat activated color changing

Have you ever seen t-shirts that change color in the sun light?  I have seen them for several years but never knew the official method behind the amazing product.  The method is called Thermochromic Dyeing.

• Thermochromic Dyeing (heat activated color changing)

According to Wikipedia September 2011, "Thermochromism is the ability of substance to change color due to a change in temperature. A mood ring is an excellent example of this, but it has many other uses such as baby bottles (changes to a different color when cool enough to drink) and kettles. Thermochromism is one of several types of chromism. The two basic approaches are based on liquid crystals and leuco dyes. Liquid crystals are used in precision applications, as their responses can be engineered to accurate temperatures, but their color range is limited by their principle of operation. Leuco dyes allow wider range of colors to be used, but their response temperatures are more difficult to set with accuracy."  Read the full definition at http://en.wikipedia.org/wiki/Thermochromism.

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If you are looking for a manufacture to help you dye textiles, try the textile dyeing and finishing section.