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This engobe has high plasticity, high water content and is sticky, it contains no gum and is intended for use on leather-hard ware. The leather hard clay absorbs a little of the water from the engobe (softening somewhat) and just waits for it to catch up. Then the two shrink and dry together, forming a good bond. If the piece is dry, however, the wet engobe quickly slakes and wets the surface, pulling pieces away as it shrinks. Of course, the thick application here has exacerbated the situation.
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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