By Henrik Norsker
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Additional info for Glazes — for the Self-Reliant Potter: A Publication of Deutsches Zentrum für Entwicklungstechnologien — GATE. A division of the Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) GmbH
Colorless opaque glazes usually look white or gray. When coloring oxides are added, they can be any possible colors. They generally are used with overglaze or on-glaze. It is possible to make glazes with every degree of transparency or opacity, such as semitransparent or semiopaque. 32 Opaque glazes have a large number of particles in them that reflect light, without allowing it to pass through the glaze. So we are not able to see through the glaze. Thus what we observe is only the surface of the glaze, which is not affected by the color of the clay underneath.
Operating procedure Before each operation: 1) Check that the ball mill is clean inside. 2) Check that pebbles fill half of the ball mill- refill if necessary. 3) Fill in materials (20-25% of mill volume). 4) Fill water until pebbles and material are just covered. 5) Be very careful about correct ball milling time. If possible, use an automatic timer. After operation: 6) After emptying the ball mill, clean it thoroughly with water by filling it and running it with the pebbles. If the same material is to be ground, cleaning is not needed.
Crushing of small amounts can be done with a hammer (use eye protection), and large amounts are usually done in a jaw crusher. Some typical uses of ball mills are: - grinding clay that does not easily slake - preparation of casting slips - grinding of body additions like feldspar, quartz and glass powder - grinding of frit granules - grinding of glazes - grinding of engobes and terra sigillata - preparing color pigments for glaze, engobes or bodies. 2. BALL MILLING There are two main types of mills: Ball mill operation Ball mills are used for fine grinding of ceramic materials.