1, nickel sulfate Widely present in daily life, mainly in alloys, such as stainless steel containing 10 to 14% nickel, white gold, Monel alloys, etc. contain nickel, nickel is widely used in electroplating due to its anticorrosive properties, as a protective layer of metal, nickel is also used as a catalyst in the production of solid fats as well as for the manufacture of glass and porcelain. People in addition to occupational exposure, life can be from jewelry (such as earrings, necklaces), metal watch chains, buttons on clothes, zippers, keys, silver coins, metal mirror frames, pins. Items such as clips, scissors, various handles, and cutlery are exposed to nickel. Nickel can also be ingested to cause systemic reactions, such as certain canned foods, dishes cooked with stainless steel cutlery and certain foods (such as fish, oysters, beans, mushrooms, onions, chocolate, etc. are rich in nickel). 2, potassium dichromate hexavalent chromium, present in cement, leather polish, textile dyes, wood preservatives, alloys, matchheads, electroplating, welding rods, preservatives, bleach, floor wax, shoe polish, paints, glues, pigments, detergents, and photography, metallurgy, engraving, printing, ceramics, automotive manufacturing, television manufacturing, printing press, eyebrows / body, etc., the paint dye. 3, p-phenylenediamine is mainly found in hair dyes, but also as fur dyes in leather. It is also used as antioxidant and accelerator in washing, printing, oil, grease, rubber and plastic. 4, formaldehyde is widely used in industrial production, life and medical supplies. Anti-wrinkle clothing, warts medicine, deodorant, cosmetics preservatives, photo paper, paper, deodorant, detergent, varnish, lacquer, printing materials, tanning raw materials, dry cleaning agents, glue, wood and tobacco smoke contain formalin. 5, benzazole Caine local anesthetic, drugs for the treatment of burns and sunburn, hemorrhoid cream / suppository, cream for the treatment of kudzu, mouth and gums medication, the treatment of sore throat sprays / cough syrup, astringent, inhibiting food medicine. 6, ethylenediamine in the fungus cream, steroid cream and rubber milk as a stabilizer, is a component of aminophylline, but also the parent of some antihistamines, is the development of accelerators, veterinary preparations, electroplating, electrophoresis gel, dyes, pesticides, artificial waxes, textile lubricants, such as solvents. 7, rosin a viscous resin-like substances extracted from pine trees. Used in the manufacture of some transparent soap, eye cosmetics, old-fashioned adhesive tape, some shoe adhesive, solder, paper products, linoleum, putty and some paint, but also exists in the topical agents, dental drugs, violin bow, athletes grip with rosin powder and pine oil cleaner. 8, epoxy resins are mainly used in epichlorohydrin and bisphenol-based adhesives, surface coatings, electrical insulators, plasticizers, polymerizers, laminates, paints and inks, embellishment products, polychlorinated ethylene products, vinyl gloves and so on.