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Plattypus

Help With Purchased "name Brand" Glazes

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I am a high school ceramics teacher. We purchase all popular brand glazes both low and cone 6. I inherited several bottles of glaze that are as old as 2007. Do glazes go bad? Can having a glaze be too thick causing it to crack and fall off the bisque ware? Please advise...

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I have some buckets of glaze that are at least 25 years old.

 

If the glaze is too thick, you could add small amounts of water until it seems a better consistency.  If you have an enthusiastic student, have him or her make test tiles and just test each old glaze to see if it's something you'd want to work with.  Could make a nice project for someone.

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Just check the labels and make sure they are not lead based. It will say on the label. Don't use those.Put some water in the jars of good ones, soak over night, and mix with a fettling knife. If you are brushing them on, no need to sieve.

TJR.

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I too inherited old glazes.

 

I had problems with two of them, flaking off before firing.  I contacted the supplier and then sent me something (binder) to add to the glaze.  It worked.  There are two previous threads all about flaking glazes and what to do with them.

 

http://community.cer...off/?hl=flaking

 

http://community.cer...king#entry68822

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