Liquid seeping through side of mug - Clay and Glaze Chemistry - Ceramic Arts Daily Community

Liquid seeping through side of mug - Clay and Glaze Chemistry - Ceramic Arts Daily Community

Hello, I've been making mugs with the two glazes, as shown in the first photo. A customer contacted me to say that their coffee had seeped through the outside wall, photo attached. I asked for some inside photo's as well, but I can't seem to add any more. This is a stoneware clay, bisque fired to

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