Well, I finally got off my duff and made something. Because I did not want to use my silver tools, I decided to make something from a mold. I created a sunburst design in paper clay, and then made a mold from it. Quite often, I will try something in paper clay first, since it is cheap and I don't care if I throw it away after finishing. I also had a mold of a turtle charm that I had made for the charm exchange by my wife at the PMC Conference. I also used that to create a bronze turtle.
As you might expect, bronze clay is heavier than silver clay, and it works differently. For one thing it appears more moist. It stays open longer, but on the downside takes longer to dry. When I was trimming it, it seemed kind of rubbery, but cut OK with the xacto knife.
I fired it in coal based carbon, ramped at 500/hr to 1550 and held for 3 hours, per instructions. I removed the top plug on the kiln and cracked the door as soon as the 3 hours were over, but it still took about 2 hours to cool so I could take it out.
Shrinkage was a lot more than I am used to with silver clay. In fact, the little turtle charm. is much too small to be used on a bracelet.
I have burnished it by hand, but am still not satisfied about the results, so I am going to try the foredom on it tomorrow.
I am not sure I will grow to like it or not. Yes, it is greatly cheaper in price, but labor on a piece is the same as for silver. And, firing is an all day affair rather than an hour or so. Cheaper material price, and cheaper selling price too. Hopefully, improvements will be made and it will go through improvements similar to the PMC generations.
If you all have any more questions, let me know and I will try to answer them. Also, as a disclaimer, the above is all just my opinion.