Hi all, I have parts being Nickel plated to AMS 2424 about 0.002-0.004 thick and being shipped over seas from the UK to the US. They have a post plating heat treatment thats at something like 900F (500C) for an hour. Typically theres a good amount of my parts that have a blue blotchy stain on them. What can turn Nickel blue? Is it a tarnish? Is it from acids or oils? People handling parts with their bare hands? Is it the heat treatment?
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