Hot or Not?

Thermochromic inks, in particular, have found their way into myriad packaging applications.

The heat is on. Or is it off?

Thermochromic inks change color with exposure to heat. They can go from colorful to colorless, colorless to colorful, or change from one color to another, according to Don Duncan, director of research, Wikoff Color Corporation. “Some cause a permanent, irreversible color change, and some give a temporary reversible color change,” he says. “Each themochromic colorant has a fixed temperature range over which its color change takes place.