I recently cast several pieces made with the HD modeling system. I
like this system because of the fine detail and toughness of the
models. I have been sending my casting jobs out with good results,
but this time decided to do it myself. I did some longer holding
times in my burnouts according to the recent MJSA issue, and all went
well except that the result was not what I expected.
The entire tree, which I cast in 18K yellow, was a dark, almost
black color. I left it in the pickle pot much longer than I normally
would, which lightened it somewhat, but it’s still a mocha color.
What did I do to cause this discoloration? I cast with a 1,000
degree flask temp because the pieces were very thin and intricate.
They filled just fine - it’s just this dark coating that I can’t
figure out.
I’m hoping there’s someone out there on Rhino that has experience
with HD material, who can give me some insight or advice.