I am not a plater but the plater I use for replating peoples tableware tells me that the metal of the item to be plated will effect the colour. So when gold plating some objects a layer of copper is put on first to help the yellow gold. Silver straight on to steel will be effected, that may explain why even clean of oxidisation the silver has a blue hue. As to Andrews dha I think it is probably the quality of the silver.
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