近几年来,国外用于印刷的扫描片及拷贝片已向低银化、明室化、高温快速显影化方向发展.国外印刷片一般含银量均在3～5g/m~2,而国内印刷片含银量为5.5～7g/m~2.日本现已使用明室型银盐拷贝片,国内汕头厂亦有新制明室拷贝片.明室拷贝片需紫外光曝光,本所为此研制了YC型黄灯低银拷贝片.一、乳剂制备及其照相性能 In recent years, overseas scanning films and copy films for printing have been developed to low silver, bright room, rapid development of high temperature.Generally foreign silver-plated printed films are 3 ~ 5g / m ~ 2, while domestic Printed film containing silver content of 5.5 ~ 7g / m ~ 2. Japan has been using a bright room-type silver salt copy film, the domestic Shantou plant also has a new copy room system. Developed YC yellow light low silver copy film. First, the preparation of emulsion and its photographic performance