Imibala ye-Themochromiczenziwe ngee-micro-capsules ezitshintsha umbala ngokubuyisela umva. Xa ubushushu bunyuselwa kwiqondo lobushushu elichaziweyo i-pigment isuka kumbala ukuya kumbala (okanye ukusuka komnye umbala ukuya komnye umbala). Umbala ubuyela kumbala wokuqala njengoko i-pigment ipholiswa phantsi.