Thermochromic paints are permanent change inks that are high temperature activated, permanent change pigment used for quality purposes in manufacturing processes such as metalworking, annealing, welding, and riveting for quality purposes where color former and color developer are intimately mixed. It has several practical uses, such as alerting someone to a potentially hot surface using thermochromic paint, which is not only extremely practical but helps to avoid serious injuries. The ability of thermochromic paints to make instantly aware of the temperature is extremely useful. It can also be used as an option to use special paints on road signs to alert drivers to specific temperatures such as freezing.