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Thread: Platinum solder joins turning black

  1. #1
    Join Date
    Nov 2019
    Posts
    1

    Default Platinum solder joins turning black

    I made a platinum diamond solitaire ring a year ago with a rub over setting. Now the customer has come back unhappy as the solder joins are turning black.

    I have made other rings with this medium platinum solder from Cooksons with no problems of discolouration. I also tested the ring with acid to check I had not used white gold by mistake but the acid stayed clear showing it was platinum solder.

    Does anyone have any advice on this. If I rhodium plate it I presume this will wear off and the black will come back.

    Thank you Richard

  2. #2
    Join Date
    Dec 2014
    Location
    South Australia
    Posts
    1,047

    Default

    I don't use platinum that often, I have never had this problem Platinum is known for it's ability to resist tarnish, are you 100% sure you did not contaminate it accidentally, maybe the customer has exposed it to a chemical of some description, and yes Rhodium plating will continually need re-plating

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