Colloidal silica for ceramic shell casting - who supplies it?

Has anyone found a source, in Australia, of colloidal silica, as used for ceramic shell investment casting?

If no luck here I'll see if I can wheedle that info out of one of the art bronze foundries - it seems that this is their favourite casting technique.

BTW if anyone is curious, I found an older book (1980) that has a good detailed how-to process description for this technique in a back shed or college situation - "Methods for Modern Sculptors" by R.D. Young and R.A. Fennell. See Trove.nla.gov.au for library holdings.


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