1. The formation of a thin film of material on the surface of paint causing it to appear lower in gloss and milky in color. It varies in composition depending on the nature of the paint, drying conditions, etc., and may sometimes be removed with a damp cloth.
2. A type of efflorescence that appears on brickwork.
3. A discoloration or change in appearance of the surface of a rubber product (as sulfur bloom and wax bloom) caused by the migration of a liquid or solid to the surface.
4. A defect on a freshly varnished surface, appearing as a cloudy film.
5. A surface film on glass; usually results from the deposition of smoke or vapor .