Imibala ye-Themochromicakhiwe ngama-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.