ruined glaze from too much epsom solution?
Posted 07 April 2013 - 03:14 PM
Coyote Ice Blue glaze for cone six. When I opened the pint jar the glaze was badly settled and hard, so after digging it out into a bowl it took several splashes (maybe 2 teaspoons?) of the solution to soften itenough to sieve it. It then seemed okay so I brushed it on three nice pots.
My kiln seems to reach cone 7 when I set it for 6, so I setit for cone 5, slow, 5 minute hold. When I opened it, the cone pack showed it had not reached cone 5! And the pots looked awful—rough and not blue or shiny at all. Refired them to cone 6 and they are much better, but still have some underfired areas. (There might be not enough glaze in those areas...)
I decided to brush on more glaze before re-firing them yet again! But when I opened the jar the glaze had solidified into a mass the consistency of soft clay. I assume it’s from too much Epsom salt solution!! Is there anything to be done to make this glaze useable now??
I’m going to contact Coyote, but I wonder if any of you helpful potters out there can advise me!!? One of the pieces is a really lovely yarn bowl that I’m donating in a few days to a silent auction for a good cause. If I can figure out how, I’ll attach a photo.
photo.JPG 33.81KB 103 downloads
Posted 07 April 2013 - 04:17 PM
As for the epson salts, I don't think that's the issue.
Posted 07 April 2013 - 05:34 PM
Posted 08 April 2013 - 07:49 AM
Marcia Selsor, Professor Emerita,
Montana State University-Billings
Marcia Selsor Studio in Brownsville, Texas.
Posted 09 April 2013 - 06:50 AM
Repeating this process will lower the concentration of epsom salts.
NOW, be forewarned, if this glaze contains any ingredients that are soluble you will be washing these out too.
My favorite suspender for brushing is a CMC gum and bentonite mix in place of part of the water but I wonder if this glaze was not already intended for brushing and if so may contain it's own brushing additives.
Contact the manufacturer about that.
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