1] Acetone : Acetone is a colorless mobile flammable liquid Use : It is most commonly used at home as an active ingredient in nail polish removers. It is also used to make plastic, fibers, drugs, and other chemicals. Health risk : Swallowing high levels of acetone can result in unconsciousness and damage to the skin in the mouth. 2) Aluminum : Aluminum is a soft and lightweight metal Use : Aluminum alloys are a vital element in the manufacture of aircrafts, rockets, automobiles , trucks, railroad cars etc . It is also used for packaging cans and foil. Powdered aluminum is commonly used for silvering in paint. Health risk: Aluminum is found to cause contact dematitis and also evidence of some degree of toxicity is seen if consumed in excessive amounts.