Making Ceramic 'Boxes' from Beginning to End
These lids of these low jars never seem to fit once fired… even though they slotted together perfectly well at the bisque fired stage. The thin rims of the lower half don’t help, and I’m sure both the lid and body warp to some degree during the reduction firing, especially considering they were placed directly next to where the burners jettison flames into the kiln, hence why one of these two has a lovely streak of oxidation, a yellow flash on the pale green.
There’s an easy fix though, and that’s what’s shown towards the end of this video, where gritty Chemico valve lapping paste is smeared onto the underside of lid, only ever on bare clay, then the two parts, lid and body, are twisted together until it spins smooth. The tiny carborundum chunks held in the grease grinding away distorted clay until both pieces slot together wonderfully again. I never use this paste on glaze, which means the material that’s ground away leaves the vessel neatly, there’s no scratched glass or ugly stoneware.
Thereafter, all it needs is a good wash in hot soapy water, and that’s the lidded jar finished.
#beforeandafter #qualitycontrol #handmade #ceramics #clay #glaze
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