Sonavi Charcoal Peel Of Mask skin, large nose pores, effects of radiation. Usage tips test to see whether you have an allergic reaction to this product apply a small amount on the back of your hand or ear. If there’s no allergic reaction or discomfort within 5 minutes, you can continue using. For ideal use only 1-2 times a week. Apply just enough of the charcoal peel off mask do not put a thick layer as this would be painful when peeling it off.