Oregon tile maker needs advice

**fayjones** · 07-31-2010, 05:21 PM

Hi, Does anyone have experience with Spectrum low stone glaze Old Copper? I just got my kiln elements replaced and my formally green glaze is coming out blue. I have customers waiting for green tiles for fireplaces. I have always fired it on slow glaze at 06. I have tried 07. I have tried slow bisque setting at 06. Would programing in a 10 minute delay help?

Thanks

**Andy Clift** · 08-02-2010, 10:36 AM

My thought is that kiln is now firing faster so the glaze is not developing like it was. I might try firing to 05. I could be wrong though. Or perhaps the a 10 minute soak at the end of the firing is a good idea. I would place cone 05 06 and 07 to see what you are truly firing to, perhaps it may be time to replace your thermocouple as well.

**Andy Clift** · 08-02-2010, 01:02 PM

One of my Facebook friends suggested the following as well.

The potter might consider programming a ramp, so that the firing is slower throughout the firing. That would duplicate aging elements.

**fayjones** · 08-02-2010, 05:53 PM

Originally Posted by Andy Clift

My thought is that kiln is now firing faster so the glaze is not developing like it was. I might try firing to 05. I could be wrong though. Or perhaps the a 10 minute soak at the end of the firing is a good idea. I would place cone 05 06 and 07 to see what you are truly firing to, perhaps it may be time to replace your thermocouple as well.

Thanks Andy,
I think I will be doing a test at 05.If nothing else I may discover abeautiful blue! But right now I am trying 06 set at slow bisque, with a 20min hold. I think that my last test was inconclusive because I was trying to refire tiles. Today I am using fresh tiles. I got the suggestion about ramping, but actually I don't know how to do that. Thanks Again.Fay

**Andy Clift** · 08-02-2010, 06:30 PM

Another facebook friend also posted the following

I worked with this glaze ,,, I was suppose to create antique looking tiles,, I tested it on white clay and also red clay,,, seemed on the white clay came bluish and the red one green,,,, I fired it to cone 06.. I am a slow fire-er person

in general,,, and also soak my kiln,,,, That was my experience with this glaze,,, hope gives u a little hint,,,If u need to see the sample ,,I have a picture of the green one,,,can send it to u,,,