Explosion hazard Concentrated<unk>  is potentially explosive like other organic<unk> s, and can cause fires without external ignition. The hazard is acute for the pure material, so the compound is generally used as a solution or a paste. For example, cosmetics contain only a small percentage of<unk>  and pose no explosion risk. Toxicity<unk>  breaks down in contact with skin, producing benzoic acid and oxygen, neither of which is very toxic. The carcinogenic potential of<unk>  has been investigated. A 1981 study published in the journal Science found that although<unk>  is not a carcinogen, it does promote cell growth when applied to an initiated tumor. The study concluded, "caution should be recommended in the use of this and other free radical-generating compounds". A 1999 IARC review of carcinogenicity studies found no convincing evidence linking<unk>  acne medication to skin cancers in humans. However, some animal studies found that the compound could act as a carcinogen and enhance the effect of known carcinogens. Skin irritation In a 1977 study using a human maximization test, 76% of subjects acquired a contact sensitization to<unk> . Formulations of 5% and 10% were used. The U.S. National Institute for Occupational Safety and Health has developed criteria for a recommended standard for occupational exposure to<unk> . Cloth staining A bleached fabric stain caused by contact with<unk> . Contact with fabrics or hair, such as from still-moist acne medication, can cause permanent color dampening almost immediately. Even secondary contact can cause bleaching; for example, contact with a towel that has been used to wash off<unk> -containing hygiene products.
Benzoyl peroxide
Photoanethole
Amylmetacresol
Tetrachlorodecaoxide
Helothermine
Hydrofluoric acid
Selenium disulfide
Dicoumarol