Because there is a photoptic tetrachlorocarbon BO blue and yellow anti-alcohol consisting of green film, with the exposure time increased light part of the diazonium decomposition.

• 由于感平液洋有碱性素蓝BO与黄色感平剂构成的绿色膜层，随着曝平工夫加长，见平局部的重氮基搀合。