Known quantities of water were placed in beakers covered with a semi-permeable membrane called Vitro-Skin™, which mimics the surface properties of human skin. Product was applied to the membrane and the rate of water loss from the beakers was measured over time. This was compared with the rate of water loss from control beakers, without any product on the membrane.
Kiasi kinachojulikana cha maji kiliwekwa kwenye viriba vilivyofunikwa na utando unaoweza kupenyeza nusu uitwao Vitro-Skin™, ambao unaiga sifa za uso wa ngozi ya binadamu. Bidhaa ilitumika kwenye utando na kiwango cha upotezaji wa maji kutoka kwa glasi kilipimwa kwa muda. Hii ililinganishwa na kiwango cha upotezaji wa maji kutoka kwa mizinga ya kudhibiti, bila bidhaa yoyote kwenye utando.