[Jewelry making - Article 00642] - Re: [Orchid] Alum - broken drill bits?

[Roger Bowersox]

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    Alum does work, but slow. 

    Sodium Bisulfate in half hot water and half Hydrogen Peroxide works
    faster for all the students that bring me broken drill bits in their
    silver pieces. I have them put their piece and the super pickle
    mixture in a beaker on the hotplate and watch the drill bit bubble
    away. A tablespoon of Sodium Bisulfate, half a cup hot water, half a
    cup Hydrogen Peroxide or a similar ratio. 


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