A student (retired dentist) in my casting class is telling about
knowing someone years ago who (sounds like a fairytale already) who
was taking coral fronds, investing them then using an acid to
dissolve out the coral and casting from there. His question was
about the acid used that would not harm the investment. I plead
absolute ignorance about if this is even possible much less what
would be used.
Comments and instruction please. Insane laughter is all right too.
Either way I get edgeecated and he gets an answer.