Lulu Posted November 18, 2011 Report Share Posted November 18, 2011 Hi, I've been doing a project with ceramics press molds making a sort of medallion. It doesn't release easily so I use corn starch to make it not stick so bad. I'm wondering if the corn starch will cause problems in my scrap clay? Can it be safely wedged into clay and not cause problems? Its organic matter and my concern is that when it burns out it could cause the clay to pop. I teach high school and I've been having the kids throw out their rejects from the molds, but I hate to waste the clay, and I'm not all that certain that they don't get a bit of corn starch into my scrap bags anyway. I've had a few small blow outs on the backs of the medallons that could be corn starch related? Any suggestions? -Lulu Link to comment Share on other sites More sharing options...
bciskepottery Posted November 18, 2011 Report Share Posted November 18, 2011 I've used corn starch on my slab work and have not had any problems with reclaimed/recycled clay. The clay seems to be able to absorb the dusting of corn starch I apply. Link to comment Share on other sites More sharing options...
Dinah Posted November 19, 2011 Report Share Posted November 19, 2011 Cornstarch has not caused any difficulties with sprigging or applied press molds for me in over 25 years. I brush/dust plaster,wood, bisqued molds with cornstarch as a repeat application will eventually become damp and clagged up and the clay will catch. Good solution. Blow outs you're experiencing could be related to plaster of paris specks, dampness, thickness, air pockets. Don't know your making routine so really can't be more specific. Link to comment Share on other sites More sharing options...
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