Anti-curl coating Gelatine is usually used to coat the back surface of the film base to prevent curling of the film. Also called Undercoating.

• 菲林显影剂内的一种成份。在显影时,,溴化钾常用作抑制灰雾的产生。其他物质如溴化钠,碘化钾和苯并三唑等都有使用。