[Jewelry making - Article 00204] - Re: [Orchid] Broken drill bits remover

[Peter W . Rowe]

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>     Sodium bisulfate (alum) pickle works fine on steel in more in
>     noble metals and aluminum - works faster hot with occasional
>     agitation. When th bubbles slow down you are almost done or are
>     done. 

    Yes indeed. But sodium bisulphate is not Alum. Alum is hydrated
    aluminum potassium sulfate. (thanks wikipedia). Sodum Bisulphate is
    the same as Sparex or the ph-down spa chemicals. A sulphuric acid
    salt, it's a good deal stronger as a solvent for drill bits than is
    alum. 

Peter
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