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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 a DIY 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. Another issue is that they try to cover too wide a firing range (thus they melt too much at the high end and not enough at the low end). 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 add 15% 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 thicker in a single brush stroke). 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 (e.g. the percentage of bentonite it contains). And the percentage of stain can be tuned for enough color but no bleeding, bubble clouding or crystallization. And we can adjust the degree of maturity by varying the proportions of MNP and Nepheline (commercial underglazes often melt too much by cone 6 and fade and diffuse as a result), this one stays opaque black.

Underglazes suitable for making silk screen transfers are another special case. The ideal one needs to cover well like this one. But it also needs to gel and harden enough to hang onto the paper but not so hard that it does not separate and transfer to the ware. Commercial products for brushing are unlikely to be optimal so it makes sense to mix your own and experiment with different amounts of gum.

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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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