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.