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COE In clay
 

COE In clay

Do all COE issues show themselves only in the glaze? Do all COE issues begin in the glaze?

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You should have went into XRF :D - go over to Saint Louis University & ask people in their Earth Sciences Dept. 

 As far as I know,  crack formation  - as you cool the melt, is rate dependent.  Here's two extremes with the same material:

Thick silica layers of Obsidian cool slowly  - not too many cracks. (deposited in volcanic layers)

Thin silica - Pele's Hair cools fast but it is thin (spewed out from the tail end of volcanic bombs!)

My 2 cents (prob. all its worth!)

 

 

Edited by terrim8

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