胶片定影实际上是溶解银的过程。疲劳的定影液一般含银为3～5克/升。黑白胶片的影像由银组成,未曝光部分的银溶解在定影液里。彩色胶片的影像由染料组成,银全部溶解在漂白后的定影液中。定影液中的银可用种种方法回收。电解法回收的银纯度高,可达99%左右;金属置 Film fixing is actually the process of dissolving silver. Fatigue of the fixing solution is generally silver is 3 to 5 grams / liter. The image of the black and white film consists of silver and the unexposed part of the silver dissolves in the fixing solution. The image of the color film is made of dye, and the silver is completely dissolved in the bleached fixing solution. Silver in the fixing solution can be recovered by various methods. Electrolytic recovery of high purity silver, up to 99%; metal home