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1990年,在对我馆缩微胶片定期检查中,发现1985～1987年加工的部分16毫米贝尔浩MD—5型胶片片基有浅棕色“灰雾”,并伴随着一定程度的影像褪色,经测定,其影像的背景密度平均降低了0.08。我们认为造成这种现象的主要原因有以下两点: 一、定影不充分。 包括定影时间不足和定影药力衰减两方面。 大家都知道,在定影过程中,海波与银盐的反应需经三个过程的变化,才能使银盐成为可溶性络盐被水洗除去。由于我馆当时使用的冲洗机是贝尔浩ABR—355型,药液为贝尔浩冲洗套药,因冲洗槽较浅（1500毫升）,在定完一定数量的胶片后,没有及时测定定影液的疲劳度和进行及时的补充,仍继续使用旧定影液,致使部分胶片的定影只进行到第二阶段就进入了水洗,从而在乳剂膜中产生了微溶性的硫代硫
In 1990, during the regular inspection of our microfilm, it was found that a portion of the 16 mm Bel-Air MD-5 film base processed from 1985 to 1987 had a light brown “fog” with a certain degree of image fading. The average background density of the images decreased by 0.08. We think the main reasons for this phenomenon are the following two points: First, the fixing is not sufficient. Including the lack of fixing time and fixing the decay of the two aspects of medicine. We all know that in the fixing process, the reaction of the sea wave and the silver salt needs three process changes, in order to make the silver salt become soluble complex salt is washed away. Because I was using the washing machine is Bell Hao ABR-355-type, the drug solution for the Bell Hao washing sets, due to the washing tank shallow (1500 ml), after fixing a certain number of films, the determination of the fixing solution in time Fatigue and timely replenishment, still continue to use the old fixative, resulting in part of the fixing of the film only into the second stage into the water, resulting in the emulsion film is slightly soluble in thio-sulfur