乳剂的质量对胶片的照相性能有决定性的影响。在乳剂制造过程中的化学、物理变化是很复杂的,我们通常把硝酸银与溴化钾化合而生成卤化银的反应叫做乳化反应,可简单地用下式表示: AgNO_3+KBr=AgBr(?)+KNO_3 这个反应过程决定了生成的卤化银颗粒的数量、大小和分布状况。因为乳化反应是所谓“离子反应”,当AgNO_3溶液与KBr— The quality of the emulsion has a decisive influence on the photographic properties of the film. The chemical and physical changes in the manufacture of emulsions are complicated. The reaction that we usually generate by combining silver nitrate and potassium bromide to form silver halide is called emulsification and can be simply expressed as: AgNO 3 + KBr = AgBr ) + KNO_3 This reaction determines the amount, size and distribution of the silver halide grains produced. Because the emulsification reaction is the so-called “ionic reaction”, when AgNO 3 solution and KBr-