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Member Since 22 Aug 2010
Offline Last Active Yesterday, 12:26 AM

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Spectrum Glaze Problem

01 October 2014 - 04:46 PM

Yesterday I glazed some of my low-fire mugs and trivets with the Spectrum 900 series glazes (909, 920, 911, 913).  The pieces are made with Asheville, NC's Highwater Clay's Stans Red clay.  I bisque-fired them to Cone 04.  I had previously fired test tiles with these glazes and a combination of the glazes using the same bisque temperature, the same clay (see 1st photo).  They turned out great.[/size]
This morning when I went to load my kiln, this is what I found (see mug and trivet photos).  Every piece was affected, whether it had only one coat (the trivets - I was going to put another coat on them this morning) or whether it was ready to go into the kiln with a combination of the glazes.  
This was the first time I've glazed with the Spectrum glazes after firing the test tiles.  I can't imagine what went wrong.  I don't want to throw away new jars of glaze, but I'm afraid to use them again.  I've glazed other pieces from the same bisque load (same clay) with other glazes….Stroke n Coat and Amaco's LG-11….. and haven't had a problem.
Any help would be greatly appreciated.  I emailed Spectrum, but thought someone on the forum might have some idea.