Porcelain Cup
Does china soften again after re-fire?
I try to create sharp edges on one of my cups. My manufacturer said the glaze will collect in corners and blur. I suggested she be fired in reverse if the varnish is in the opposite direction and will not collect in the corners. He said that the fire makes the bone china. I have not heard this before. Is this true? Thank you.
Yes, it actually can. The clay can melt into a lump in your oven if you shoot at a temperature that is too high for the clay. If you've used kiln sitters or pyrometric cones you should know. They are based on different clays that will aim at different temperatures. Thus, good sintering temperature of the clay is actually somewhat flexible. If for example you have a sculpture of a person with outstretched arms on the side Weapons do not collapse down a bit during baking. Not much, but it is enough to warp a shape. The problem with the firing of a cup upside down with a glaze is more than four stilts are likely to leave a mark, and you have to support your cup with them in prominent places. Depending on your cup-shaped depression may not pose much problem.
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