自从四甲基联苯胺成为联苯胺的替代品用于显现潜血手印以来,一直是显现潜血手印的首选方法.其显现原理是四甲基联苯胺被氧化,生成四甲基联苯胺蓝使浅色或无色手印显现为蓝绿色.但在实际工作中对黑色等较深色客体上的手印反差小,不易拍照给以后的工作带来困难.笔者在实际工作中摸索出一种简单易于操作的方法并用于实际办案. Tetramethylbenzidine has been the preferred method for developing occult fingerprints since it became a substitute for benzidine for the purpose of developing occult fingerprints, revealing that tetramethylbenzidine is oxidized to produce tetramethylbenzidine blue to light colors Or colorless fingerprints appear as blue-green, but in practical work on black and other darker objects on the handprint contrast is small, difficult to take pictures to the future work difficult.I in the actual work to explore a simple and easy to operate Method and used in the actual handling.