试验结果表明，采用真空蒸馏法脱除粗铋中银代替传统的加锌除银法，在技术上是可行的。
The test results show that it is technically feasible to separate silver from crude bismuth by vacuum distillation instead of traditional Parke's process of desilverization(zinc desilverization).
最后将银法和铁钼法的生产工艺和方法进行了比较，突出了尾气循环银法生产甲醛工艺的优点。
Finally, a comparison between the two technologies catalytic by silver and iron-molybdenum was made, merits of exhaust gas cycling technique for production of formaldehyde were shown significantly.
他的发现，“银版照相法”，于1839年公布。
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