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米吐尔对苯二酚和菲尼冬对苯二酚等超加和性显影剂,在空气中的氧化过程是比较明确的。Tausch指出,将米吐尔对苯二酚显影剂暴露于空气、氧气或溴化银中,对苯二酚首先消耗。只有当对苯二酚完全耗尽以后,米吐尔的浓度才开始降低。后来人们提出,米吐尔的氧化产物和对苯二酚之间的相互再生反应使它不致消耗殆尽。溶液中的硫酸盐会促进对苯二酚的氧化,因为后者很易硫化。这一观点已由对显
The ultra-additive developers such as metol hydroquinone and phenoxydihydroquinone, the oxidation process in the air is relatively clear. Tausch pointed out that the Mitu hydroquinone developer was exposed to air, oxygen, or silver bromide, and hydroquinone was first consumed. Only when hydroquinone was completely consumed did the Metul concentration start to decrease. It was later proposed that the mutual regeneration reaction between the oxidation product of metol and hydroquinone would not consume it. The sulphate in the solution promotes the oxidation of hydroquinone, which is very susceptible to vulcanization. This view has been made