Themochromic pigmentbigizwe na micro-capsules ihindura ibara muburyo butandukanye.Iyo ubushyuhe buzamutse kugera ku bushyuhe bwagenwe pigment iva ibara igana ibara (cyangwa kuva ibara rimwe ujya irindi bara).Ibara risubira mwibara ryumwimerere nkuko pigment ikonje.