Overview and close up picture of a filled in mudcrack pattern that originated in the glaze application. This glaze separates into two liquid phases with substantially different melting points, viscosity and surface tension.

Overview

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Closeup

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A mudcrack pattern created in the glaze application is seen after firing as a glossy white inclusion in the waxy pale grey glaze. We speculate that in the early part of the firing, the glaze crawled back from the gaps left by the glaze application. Later in the firing, the glaze separated into a LLW fluid low melting phase component, and a more refractory component. The LLW component flowed into the bare part of the pot where the glaze had crawled during the early part of the firing