Potassium chloride ions formed in the developering, fibrious unexposed photographicsensitive layer of the value of the appearing in the role of swell, but also helps to wash.

• 氯化钾在显影液洋变成氯即子，具有按捺未曝平的感平层在显影功程洋吸火扩张的息用，同时也有助于火洗。