Colloidal silica gel for problem skin. 10 minute gel to: -Bind and reduce bacteria, -Clear excess oil (sebum) and impurities, -Reduce spots and blackheads silicol®skin has a unique mode of action physically binding nasties from the skin. Its key ingredient, colloidal silica works naturally to adsorb irritants, impurities and bacteria. These may be the cause of problem skin, spots and blackheads. Dermatologically tested for skin tolerance with a 5 star rating.