The green goo on Ben's eyes and bottom, as well as on the rim of his hat/lid is a wax that will keep a coloured glaze from covering the white clay and will stop glaze from coating the clay where the face jug will be setting on a kin shelf. Glaze that hits the shelf will attach Ben to the shelf (creating a very large base that is not ever intended!)and/or create a terrible mess for clean up. Other kiln users truly appreciate it when you do not cover the shelves they need in glaze.
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