Hypercolor
（重定向自Hypercolour）
![Example of a Hypercolor T-shirt. A hair dryer was used to change the blue to turquoise.](/Images/godic/202501/19/Generra_Hypercolor0606.jpg")
![Another example of a Hypercolor T-shirt.](/Images/godic/202501/19/Generra_Hypercolor_20606.jpg")
![Transformation between leuco and colored form of crystal violet lactone in response to varying acidity, which is caused by changing temperature](/Images/godic/202501/19/Crystal_violet_lactone-reaction0606.png")
Hypercolor was a line of clothing, mainly T-shirts and shorts, that changed color with heat.
They were manufactured by Generra Sportswear Company of Seattle and marketed in the United States as Generra Hypercolor or Generra Hypergrafix and elsewhere as Global Hypercolor. They contained a thermochromic pigment made by Matsui Shikiso Chemical of Japan, that changed between two colors – one when cold, one when warm. The shirts were produced with several color change choices beginning in 1991. The effect could easily be permanently damaged, particularly when the clothing was washed in hotter than recommended water, ironed, bleached or tumble-dried.