Oct 22, 2026: We are working on protecting our servers against the PHP2Shell vulnerability just discovered. The CDN download server is back online. The digitalfire and insight-live servers were patched on Oct 21.
A body firing problem where particles of calcium sulphate in the fired or bisque fired body slowly absorb water from the air, expand, and pop out a section of the body. These particles can be contamination or naturally occurring contaminants in the clay.

This picture has its own page with more detail, click here to see it.
This is a common problem for people who mix their own clay bodies, using raw, unground clay materials.
![]() PayPal | No tracking, No ads, No paywall, No transient content! Just organized, concise information constantly updated and improved. Was this helpful? Consider supporting me. |
| By Tony Hansen Follow me on ![]() | ![]() |
Buy me a coffee and we can talk