The thermochromic dye is usually a mixture of a leuco dye (a dye whose molecules can take on two forms, one colorless; Hypercolor shirts often used crystal violet lactone), a weak acid, and a ...

Mental Floss explains that the shirts were dyed twice: first with a permanent dye and again with a thermochromatic dye. The thermochromic dye is usually a mixture of a leuco dye, a weak acid, and ...

The novelty shirts, shorts, and pants were one of the hottest clothing items of 1991, with a special dye that changed color in response to temperature changes. Before long, Hypercolor proved to be ...

The extracted dye from the female cochineal bugs is used to color foods, makeup, and clothing. Cochineal dye is great because it can be used to get various colors when mixed with different solutions.

As you could have predicted, a pH of 7 isn't acidic enough to activate the acid dye. We do get a little bit of color, which we can attribute to a low level of hydrogen bonding, along with a little ...