Wednesday, February 10, 2010
So, last night while creative healing I put a few copper and bronze pieces in the kiln. When I took them out, I was greated by some lovely color, But upon further inspection I noticed some cracking, then as I tried to clean them up with a steel brush - I got dust! All these chubby hearts were hard on the outside and pulverized in the middle. Looking on the bright side, because I'm all about possibilities, I can mix these lovely grains and chunks with my newly acquired Golden mediums for a lovely textured background. I've been experimenting a bit with the firing schedule to accommodate the higher temperature required for the copper. But this is new. If you fired Copper Clay, do you have any pointers or a proven firing schedule? It's a bit hard to figure what I did wrong this time, a few variables from previous successful firings. In this particular batch:
}I used up some old copper and bronze clay (stored in the same baggie, wrapped separately.
}It was kept in a cool place and seemed pretty pliable when working with it.
}some might not have been totally dry, but most were - that didn't seem to matter in the fired pieces
}used coconut carbon in a steel container
}here's where I think I went wrong. I fired it with a Ramp of 500 an hour to 1700 (way too hot even for copper) and held it for 3 hours in my Paragon kiln.
Oh well, better luck next time, I guess.