Nail polish, or nail varnish, is a lacquer applied to human fingernails or toenails to decorate and/or protect the nail. Today’s nail polishes are usually nitrocellulose in a solvent such as butyl acetate or ethyl acetate. They may be clear or coloured with pigments. The coating has a plasticizers (e.g. camphor). This links polymer chains, spacing them to make the film flexible after drying. That way it resists cracking or flaking caused by the natural movement of the nail.