[Jewelry making - Article 00661] - [Orchid] Effects of lead in 925 Silver

[Peter James]

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    I have recently had 2 questions asked of me regarding very bad
    silver castings. Both cases are from the same country but different
    customers. The silver castings are incomplete, at first yes you
    think of short filling. But it clearly is not short filling, it
    looks like there has been a very violent reaction in the silver when
    it has entered the flask (almost as if it exploded). I was told by
    both people concerned that the fine silver used was 99.9, this got
    me to wondering what trace elements were in the 99.9 fine silver. I
    am sure the fine was taken from photographic plates and perhaps
    x-ray plates. I know both of these contain many other alloys other
    than silver, i was wondering if anyone can help me by explaining the
    effect that maybe Lead can have when melting silver and casting, i
    am clear on the effect of Boron and others but Lead i am not sure
    about other than of course its poisonous. Can it cause a violent
    reaction or not, does the silver become unstable when entering the
    flask? 

    I hope someone can help me, 

Thanks much,
Pete Croton
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