I have had a packet of Fast Fire BronzClay sitting on my bench beckoning to me for a week or so, but I haven't been able to sit down and try it. Finally, I was able to make some time.
I had read that the new BronzClay feels like marshmallow. I can't compare to the old, but I can say that I do see why people would say that. It's got a lighter, less dense, feeling than silver or copper clay. I kind of liked the feeling. It didn't seem to dry out too quickly and took a texture quite well. I only bought 30 grams, which didn't go very far because I made a fairly large and thick piece from a butterfly metal stamping.
Once dry, the BronzClay feels more flexible than silver and copper. Silver, especially, is fairly rigid when fully dry, but the BronzClay was bendable and I was afraid I would break it. It feels softer when filing it as well. Wet clay seems to stick well to dry so it's easy to fill cracks and holes.
I am not entirely happy with the finished product. The bottom of the butterfly's left wing has lost some detail and also has some pitting, and it was hard to remove the crusty stuff from the pits. I bent the wings a bit to put the butterfly in a bit of a curve and it separated from the part of the body that I had added to the wings. It does seem to be sintered all the way through, though.
Here is a photo of the bronze piece (right) beside the metal stamping I used for the design to illustrate the shrinkage, which is significant. Even though they look the same color in this photo, the bronze butterfly is a nice warm gold, but polishing did not get it as shiny as I expected. I did not try tumbling it.
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