Formaldehyde (FAH) is a colorless, flammable gas with a strong, pungent odor. It is widely used in hospitals, in disinfectants, in carpet and furniture glues, and in a large number of other products. FAH is used in liquid form as a water and methanol solution called Formalin, which has a clear to milky appearance, and in solid form as a white powder called Para-formaldehyde. Formaldehyde gas may be given off by either liquid Formalin or Paraformaldehyde powder.