[Jewelry making - Article 00947] - [Orchid] Firescale after casting

[rebecca engel]

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    On this subject of firscale associated to soldering, I was
    wondering if anyone has encountered grey/purple ghosts from using
    an aluminum oxide buff on casted silver.  I use this process
    often and I'm baffled by the reoccurring blobs that appear when
    the piece begins to oxidize.  Can firescale occur from the
    casting process?  Any advise would be appreciated. 

Rebecca.
San Diego CA  

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