| 摘要 |
A photographic black-and-white reversal first developer, which is substantially free from hydroquinone and which contains at least substances a) to d):a) hydroquinonesulphonic acid,b) a polyglycol with an average molecular weight of 200 to 600,c) an anti-fogging agent, andd) an auxiliary developer,gives clear light regions and high maximum densities after reversal development and can also be used at temperatures considerably above 20° C.
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