Many conservators are reluctant to use silver dips based on thiourea because of reported problems such as yellowing and retarnishing as well as brown spots on daguerreotypes. Silver dips are report...

中文翻译：

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银和酸性硫脲浸银：通过电化学监测漂洗和老化

许多保护人员不愿意使用基于硫脲的银浸液，因为据报道存在泛黄和变色以及银版照片上的褐色斑点等问题。报告称银价下跌...