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?