[Jewelry making - Article 00239] - Re: [Orchid] Bronze casting temperatures

[James Binnion]

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    Try a lower flask temperature like 900-1000. Most bronze melts at so
    high a temperature that it is really right at the limits of what the
    gypsum bonded investment can take before it breaks down. When it
    breaks down sulfur dioxide is released and that causes severe tarnish
    / firescale and the investment can "flux" or glassify and this
    resulting hard white deposit will be very difficult to remove and
    will leave a terrible surface under it after removal. 

    Best results will be from keeping the flask as cool as necessary to
    fill the mold cavities. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550

 
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