A photomechanically produced plate for pictures or type made by exposing a gelatin film under a negative, hardening it with chrome alum, and printing directly from it.

• 珂罗版印刷法一种通过照相制版工艺制造出来的用于印刷图片或文字的图版，将一层胶制剂薄片置于底片之下，用硫酸铬钾使之坚硬，然后便可直接印刷