Themochromic pigmentsyog tsim los ntawm micro-capsules uas hloov xim reversibly.Thaum qhov kub thiab txias tau nce mus rau qhov ntsuas kub, cov xim mus los ntawm cov xim tsis muaj xim (los yog los ntawm ib xim mus rau lwm xim).Cov xim rov qab rau cov xim qub thaum cov xim yog txias.
