Temperature sensitive ink is the ink whose temperature can be changed with temperature .The reversible discoloration ink :itss colorcan be changed into another color and it can restore its color after being cooled.

Color: green -yellow, black -red or yellow (the temperture is 10℃ 30℃ 40℃ 50℃ 60℃ )

Color: Red-green, red-black, green-red,black-bule, bule-green, bule-red(the temperature is 60℃ 

It will be more appearciated if you place a trial order, and i am be assured of the quality and the delivery.