[Jewelry making - Article 00815] - Re: [Orchid] Yellow Film on Argentium Sterling Silver

[James Binnion]

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>     nasmuch as silver oxide is white! I even think I heard that the
>     white residue on f. inst. Sterling after pickling is silver oxide. 

    Silver doesn't like to form a stable oxide easily at room
    temperature from just exposure to atmospheric oxygen. Just heating it
    will not make it convert to stable silver oxide either it releases
    the oxygen as it cools. To make silver oxide you would need a
    reaction like combining silver nitrate and sodium hydroxide the
    precipitate of this reaction is silver oxide (don't try this with out
    proper safety gear as it is a fairly active reaction). And silver
    oxide is a grey to black powder. Tarnish on metallic silver (sterling
    or fine) is a silver sulfide not silver oxide. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550

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