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Six layers, 85% Alberta Slip in the glaze, yet no cracking. How? CMC gum.

Six layers of any normal dipping glaze would be impossible, flaking usually starts with the second layer. Yet this slurry is 85% plastic clay, it shrinks so much that it would be like a "dried-up lake bed" on the first layer. By the second layer it would all just fall off! How was it possible to dip six layers here? A 1% CMC gum addition (via a gum solution). Gums are often added to low-clay-content glazes to dry-harden them. But with all the clay in this one, no help is needed for hardening. This is an incredible demonstration of the power of a gum as an adhesive and hardener: It has sufficient power to actually counteract drying shrinkage! Of course, there is a downside: A drying period is needed between each layer, the length depends on the porosity and wall thickness of the ware and the amount of gum. This also demonstrates the difference between the function of Veegum (and similar materials) with CMC. The former, if added to this recipe, would gel the slurry, require more water and drastically increase the shrinkage, making the cracking even worse. Of course, one could simply use a mix of calcine:raw Alberta Slip to control drying shrinkage and gum would not be needed.

A small cup with multiple layers of glaze applied, and no cracks

Related Pictures

Paint another layer onto a fired glaze? Yes. With CMC gum.


The cone 6 mug on the left has the G3933A glaze, applied as a dipping glaze. It turned out poorly - crawling from corners and looking thin and washed out. I made a brushing glaze version of this (which adds 1.5% CMC gum), I keep it around for this very purpose. It has a high specific gravity (unlike commercial ones that have high water contents - they will run and go on too thin if you try this). Because of the gum it dries hard, there is no shrinkage or cracking. On a second firing, using the C6DHSC schedule again, (mug on the right) the surface is transformed - thicker, more vibrant color (being picked up from the underlying body).

Links

Glossary Base-Coat Dipping Glaze
These are ceramic glazes intended for dipping but which contain a gum to enable them to adhere to the body better and tolerate over-layers without danger of flaking or cracking.
Materials CMC Gum
CMC gum is indispensable for many types of ceramic glazes. It is a glue and is mainly used to slow drying and improve adhesion and dry hardness.

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