PERISHING, CRUMBLING, RUSTING.
By this we mean a gradual loss of lustre, the final result of which is a disruption of the surface ending in a complete destruction of the varnish. Washing with water heated beyond the tepid degree is an engaging bid for the disaster here noted. Ammonia fumes, coal gas, salt sea air, soil of limestone localities, etc., cause varnish to perish and crumble away.