[Jewelry making - Article 00673] - Re: [Orchid] Casting Cleanup

[ameeprecious]

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    I pickle my casting tree (Silver or Gold) after quenching it in the
    water, with 50 percent phosphoric acid ( 50% water plus 50%
    phospharic acid) for 15 minutes, heat up to 45 degrees centigrade in
    a Borocil beaker or a borocil bowl. all the oxid film is removed as
    well as the investment soften downs which can be easily removed with
    a tooth bursh or water jet pressure, efforlessely with no traces of
    investment left. Always store the used phospharaic acid in a glass or
    plastic container. Use it carefully even though it is not corrosive
    as sulphuric acid to skin contact. Nuetralize the acid on the
    castings with Baking soda solution prepared in clean water. 

    Use protective eye wear while using the acid, keep baking soda with
    in reach to nuetralize the acid,in case of accidental spills. Put
    acid in to water, while mixing it to make 50 percent strength.USE
    THE ACID WITH CARE. 

    One can use the above acid at room temperature by soaking the
    castings for an hour or can keep over night with out any damage to
    the castings, whether silver or gold. Use copper tongs or plastic or
    rubber coated tongs or brass tongs to place and remove the castings
    from the acid. 

    I am using the above acid and method for softening the investment
    and remove the oxide film from the casted tree, since last 15 years
    sucessfully with out damage to the castings of gold and silver,
    brass and copper castings can also be successfully cleaned with this
    method and use of phosphoric acid as above. 

    Hope this helps. 
    May God bless all with total Health- Physical. Mental, spiritual and
    Social. 
    Strive to be Happy 
    Be Happy 

Umesh
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