Sulfate Scum
A yellow coloration can appears on the dry glaze surface, or on the bisque clay surface on the opposite side of a vessel wall that has just been glazed. The coloration does not appear immediately, but some time during the dryout of the piece. This is a product of soluble or partially soluble sulfates in the clay which, when given extended contact with the water from the applied glaze, dissolve and migrate to the surface with it. This phenomenon can happen even with porcelains and it is the product of drying the ware too slowly. In industry, care is take to dry ware quickly so the solution and migration does not occur. This can be done by heating the ware or putting it in a drying chamber immediately after glazing. Out Bound Links
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- Login to a private account or work with others in a group account (e.g. university).
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- Many ways to search and classify glaze and body recipes.
- Glaze and body recipes are robust, with units-of-measure, unlimited pictures with individual titles and descriptions.
- Add variations to a recipe; each with its own pictures, descriptions and name/code-number extensions.
- Recipes can link to typecodes, projects and firing schedules (all managed in their own areas).
- Standard reports and mix ticket reports with last-minute-totalling; variations report as if they are a complete recipe.
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Imports many file formats
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- Assign a batch number to imports, and later search by batch.
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- Prepend character sequences to glaze recipe names during import.
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