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This is what happens when applying a non-gummed engobe or underglaze to bisque ware

The drying shrinkage of engobes and underglazes (and stickiness that goes with that) are important for adherence for application at the leather hard stage (they do not melt like glazes so do not glass-bond to the body). Wet adherence and shrinking together with the body during drying enhance the otherwise fragile interface. But not on bisque ware. If, however, the engobe is gummed it can appear to adhere to the bisque - but the fired bond with the body will not be as good as when applied at leather hard stage. Some underglazes employ calcined clays to minimize shrinkage for better compatibility with bisque, but it is still difficult to understand how they could develop any sort of quality fired bond!

Engobe flaking off bisque

Related Pictures

When making your own black underglaze makes sense


Black underglazed bowl

Black brushwork needs to go on thick enough in one brushstroke. Commercial products we have don't do that - thus my motivation to work on this. I am experimenting on cone 6 Polar Ice porcelain jiggered bowls using G2926B dipping glaze. The base underglaze recipe here is a 90:10 MNP:nepheline syenite mix (you could use your own porcelain instead of MNP and feldspar instead of nepheline). To that, I added 20% black stain, 1.5% CMC gum and 5% bentonite. With the CMC gum and bentonite, and blender mixing, a brushable consistency that stays put can be achieved at a fairly low water content compared to commercial products (enabling it to go on thick enough in a single brush stroke). The freedom to fiddle with the recipe enables tuning both the application and firing properties. For example, assuming application at leather hard state, the drying and firing shrinkage can be matched to the body by varying the plasticity of the porcelain used (or the percentage of bentonite). And the percentage of stain can be tuned to get enough color but no bleeding, bubble clouding or crystallization (e.g. we later adjusted to 15%).

Links

Glossary Engobe
Engobes are high-clay slurries that are applied to leather hard or dry ceramics. They fire opaque and are used for functional or decorative purposes. They are formulated to match the firing shrinkage and thermal expansion of the body.

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