I cast some charms and pendants out of the Rio Grande “Ancient
Bronze” for the first time yesterday. I was quite confused by what
little info I could find on bronze casting in books and online. I
found several widely varying melt/flow temperatures–anywhere
between 1800F and 1950F. The variance was due to differences in the
makeup of different types of bronze. I don’t know what the exact
makeup of “Ancient Bronze” is, so I had to guess.
And I only found one reference to flask temperature–1250F. I checked
the grain every 500 degrees as the electromelt heated. It finally
melted at a temp very close to 2000F (top end of the gauge on the
electromelt). I set the kiln to keep the flasks at 1250F and cast at
The resulting bronze was all covered in thick firescale and it
took a lot longer to get the stuck-on investment off the pieces than
it does with silver. Is this normal, or did I do something wrong?
Feathered Gems Jewelry