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URL: Surfactants at Wikipedia
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Why do gummed dipping glazes do this as they dry? How to fix it.
Gummed glazes dry slowly and on porous, dry bisque this often happens. The one on the top left was dipped for three seconds, and the ones on the top right and bottom right for five seconds. Thus, the thicker the application the worse this is. A complicating factor is that this is a base-coat dipping glaze, it has enough gum to slow down drying significantly, providing plenty of time for escaping air, displaced by the water being absorbed, to create these holes. If these tiles were much thinner the problem would obviously be much less. But the thickness also enables a simple solution: The bottom left tile was dipped into water first. An extra benefit of the water is that the glaze penetrates into recesses in the surface better.
Links
| Troubles |
Foaming of Ceramicd Glaze Slurries
Ceramic glaze slurries can sometimes generate enough foam that it becomes difficult to apply an even layer to a surface. What can you do? |
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| Glossary |
Surface Tension
In ceramics, surface tension is discussed in two contexts: The glaze melt and the glaze suspension. In both, the quality of the glaze surface is impacted. |
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