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Ceramic Slips and Engobes
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Terra Sigillata
Composition: Very fine particles of clay with a high iron content. Application methods: Brushing or spraying. Effect on ceramics: Provides a smooth, glossy finish that is often burnished.
Porcelain Slip
Composition: High purity kaolin, feldspar, and silica. Application methods: Casting in plaster molds or hand application. Effect on ceramics: Creates a translucent, white and smooth surface.
Lichen Slip
Composition: A mixture of clay, water, and other materials causing irregular surface effects. Application methods: Spraying or brushing. Effect on ceramics: Mimics the natural appearance of lichen on rocks, often used for aesthetic value.
Casting Slip
Composition: A liquid clay body formulated for slip casting. Application methods: Poured into plaster molds for precise replication. Effect on ceramics: Enables mass production of uniform shapes and delicate items.
Underglaze Slip
Composition: Finely sieved clay slip with colorant oxides or stains. Application methods: Brushing, trailing, dipping or sponging on leather-hard or bisque ware. Effect on ceramics: Provides a colored design that is covered with a clear or transparent glaze.
Helios Porcelain Slip
Composition: Refined kaolin with fluxes like feldspar and silica for translucency. Application methods: Pouring into gypsum molds for slip casting. Effect on ceramics: Yields a highly translucent body with a fine and smooth surface.
Paper Slip
Composition: Porcelain slip with cellulose fiber added. Application methods: Pouring or coiling in molds. Effect on ceramics: Creates a strong yet lightweight structure, allowing for thin-walled ceramics.
Majolica Slip
Composition: Earthenware slip with tin oxide added for opacity. Application methods: Typically applied to the entire surface of a bisqued pot. Effect on ceramics: Creates a smooth, opaque white surface suitable for colorful, overglaze painting.
Onggi Slip
Composition: Natural clay mixed with sand and other aggregates. Application methods: Slab building and coil-and-throw technique. Effect on ceramics: Used in Korean Onggi pottery, allows for breathable storage vessels.
Sgraffito Slip
Composition: Colored slip with a contrasting clay body beneath. Application methods: Applied thickly and then carved to reveal the underlying body. Effect on ceramics: Creates contrasting two-tone designs with texture.
Metallic Slip
Composition: Clay and metallic oxides such as copper or iron. Application methods: Brushing, trailing. Effect on ceramics: Yields a metallic sheen and can contribute to special glaze effects.
Crackle Slip
Composition: Clay with extra silica which increases its expansion upon heating. Application methods: Applied to the surface and allowed to dry. Effect on ceramics: Produces a fine network of cracks for aesthetic purposes.
White Slip
Composition: White firing clay and kaolin. Application methods: Brushing, trailing, or pouring. Effect on ceramics: Creates a white, often opaque, background suitable for colored decorations.
Engobe
Composition: Clay, water, and sometimes additives to improve texture or workability. Application methods: Dipping, brushing, spraying. Effect on ceramics: Provides a smooth surface for painting or as an underglaze, can also be textured.
Colored Slip
Composition: A mixture of clay, water, and coloring oxides or stains. Application methods: Brushing, trailing, and slip trailing. Effect on ceramics: Adds vibrant color and can be used for detailed decoration.
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