Thursday, September 15, 2011
As I was looking at the pieces that warped during the two once firings, highly disappointed, I was thinking how I like the slip colors on the white clay, but I also like the slip colors on the red clay. So I have to find a way to get the red clay to work. Maybe not this red clay, but some type of red clay.
The red clay seems to change the look of the slip colors warming them up and I like that look. I also like the crisp look of the white clay as the backdrop for the slip colors. I was looking at the pieces made from the white clay and wondering what each one of them would have looked like with red clay and visa versa. So for now I'll be working on parallel lines of work, one with white clay and one with red clay.
Do you know what caused this strange swirl mark on the back of the clay. Gary said it looks like a smoke pattern burning off. During the first once fire I fired the red clay pieces upright and they slumped in the middle and warped. So in the next once firing I turned them upside down and fired them with the slip side on the kiln shelf. That's when I got these swirl marks. Oh I just noticed the swirl marks are only one one type of red clay the other clay is more of a brown and it doesn't have the swirl marks.
Today I was wondering if the swirls could be from how the clay was mixed. I use the clay straight off the slab and then roll it out in several directions. I wondered if the swirl mark could have come from some of the clay not being mixed, but that doesn't seem possible. Surely the clay is mixed better than that before it's shaped in the blocks of clay at the factory. Could they be just about ready to crack in that pattern, they don't seem to be weak in any way at that point. Any thoughts?
Here's one that didn't warp too bad and was fired upside down, but some kiln wash stuck to two of the dots and I've been trying to sand that off. See what I mean about the red clay warming up the colors of the slip. The rest are photos of the warped pieces.
I think the warping may have come from how I dried these pieces I had them propped on some soft foam and they may have retracted trying to shrink and that caused the stress in the middle. Better luck next time. Thanks for reading and for all your comments.