[Jewelry making - Article 01399] - [Orchid] Bi-Metal Casting

[Tim Blades]

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    I have a problem I thought that some of you more experienced casters
    might have the solution for, I have just cast a small sculpture in
    bronze of a figure clutching a silver fish. 

    I cast the fish and cleaned it up and poured the wax for the figure
    around it, I then burnt it out, quite a few hours, it weighed a
    couple of kilo's , when I opened the flask the fish was encased in a
    hard grey amorphous blob of plaster which when pressure washed off
    the silver had been eaten away as if etched. It seemed to have lost
    about a millimetre of metal off the surface. Why? 

    I am trying a sample piece today with boric acid in the mix ,4
    percent  like the stone in place casters do , I know it is not
    exactly a jewllery item but I thought it is more in this line than
    normal sculpture casting. Any one got any ideas? 

Many thanks,
Tim Blades.

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