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Crazing Test for Dark Glazes


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#1 Min

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Posted 15 February 2013 - 11:31 AM

Does anyone have a method to check for crazing with dark glazes? My normal method for craze testing is to heat a glazed test pot in the oven @ 325 for 30 minutes then plunge the pot into room temp water, then repeat procedure twice, each time increasing the oven temp by 5 degrees. Then I rub sumi ink onto the pot, leave it sit for a few minutes, rinse and check for crazing. Works for clear, whites and most glazes but obviously not for black or very dark brown etc. I tried floating a solution of isopropanol and nepsy on a flat test piece, logic being the alcohol would evaporate leaving the nepsy in the crazing if there was any. Results were messy and not that conclusive. Any suggestions?

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#2 Diane Puckett

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Posted 16 February 2013 - 03:05 PM

What about white ink? Dick Blick sells it online.
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#3 Min

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Posted 16 February 2013 - 06:38 PM

Thanks for the idea Diane, I'll give it a try with a high expansion glaze that I know would craze on my clay to try it and see.




What about white ink? Dick Blick sells it online.


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#4 bciskepottery

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Posted 16 February 2013 - 09:27 PM

An LED flashlight may show crazing.




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