Cellulose paints are a special type of oil paint. They are made of celluloid sheets, nitrogen cotton, amyl acetate and photographic films. In the case of normal oil paints, the layer is hardened by oxidation, but in this case, the layer is hardened by the evaporation of the solvent. It provides a smooth finish and is not affected by smoke, water, acids etc. It is very costly and only used for painting aircrafts, motor cars etc.