Izingulube ze-Themochromic zakhiwa ama-micro-capsules ashintsha umbala ngokubuyela emuva.Lapho izinga lokushisa likhuphukela ezingeni lokushisa elithile i-pigment isuka kombala iye kombala (noma isuka kombala iye komunye).Umbala ubuyela kumbala wangempela njengoba i-pigment ipholiswa phansi.