固白剂在黑白照相纸中的应用试验

A Study on the Use of Whitening Agent Fastener in Black-and-white Photographic Paper

提高黑白照相纸影像画面白度的主要方法之一是荧光增白剂的采用，但由于荧光增白剂分子易受加工过程中的酸碱和漂洗的影响而流失，从而降低了影像画面的白度。固白剂的应用有助于提高荧光增白剂的耐光性、耐酸碱和耐漂水性能，有效地防止荧光增白剂分子在冲洗加工中的扩散流失，达到了固白增白的效果。

Though fluorescent whitening agents can improve significantly the whiteness of black-and-white photographic paper's image picture, this effect may be reduced owing to the shift of whitener molecules during the photographlc processing and induced by acids, alcalis and washing. The use of whitening agent fastcner can increase the resistance of fluorescent whitening agents to the action of light, acids, alcalis and washing, thus preventing their diffusion and shift during processing, consequently improve the overall whiteness quality.