NYCFlasks
Posts: 401
Joined: 9/11/2005 Status: offline
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Looks like to me from the floor of the kiln. Remember, the stoneware is salt glazed, and the salt was just thrown in with a shovel. I have seen pieces with such heavy salt on them that they resemble what you show in your pictures. It could be a very heavy buildup of salt residue from the glazing process. Now, another thing it could be. The pottery when it is air dried still retains water in the clay, trapped on a very small scale. When the fire is first lit, it was burned at a low rate to slowly drive out the water trapped in the clay. If you ramp up the fire too quickly, you will get a steam explosion,which will demolish the kiln and the surrounding structure (this is also true of large industrial boilers, such as Cleaver Brooks). This water vapor will condense on the kiln walls and run down the sides, dripping on the pottery (I have a piece in my collection with a large "salt tear" on it) taking salts with it and building up these salts over time on the lower walls.
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