Formaldehyde is a chemical found in 1867 by August von Hofmann, a German scientist. The chemical compound of formaldehyde is hydrogen, carbon, and oxygen (HCHO or CH2O). At an ordinary temperature, formaldehyde is a very pungent gas, that can be compressed into a liquid that boils at -21 degrees Celsius. The trade name for this chemical is formalin, which is 40% formaldehyde and 60% water or water and methyl alcohol. Formalin and formaldehyde can be found in disinfectants, insecticide, fungicide, deodorant, pressed boards, particle boards, and smoking. The pressed boards that it can be found in is plywood used for paneling, furniture, and other products, particleboards used for shelving, countertops, flood underlay, some laminated flooring, furniture and medium Density Fiberboard (MDF) used for cabinets, furniture, doors, and some laminated flooring. This chemical can be found in newer houses, but can decrease over time, though the levels can increase due to temperature and humidity. It can also be found in leather, along with other compound such as alum, glutaraldehyde, and synthetic tannins (Syntans). Formaldehyde, along with these other chemicals, are used to impart special characteristics of the leather. The symptoms from inhaling too much of this chemical are soar throats, cough, scratchy eyes, and nose bleeds.