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Third Friday Cone 6 Commercial Glaze Tests - Georgies Part 2

Welcome to the Third Friday Commercial Cone 6 glaze test post. 
This is part 2 of I'm not quite sure how many. Part 1 is here.
This second part is running the same tests, in the same kiln - but instead of my normal Cone 5 (for a cone 4-6 glaze), I fired this batch to Cone 6 in my small test kiln.
These photos are the Georgies glazes I was testing:
Cone 5 Small Kiln = Left pendant.
Cone 6 Small Kiln = Right pendant.

The photos don't show much of a difference between Cone 5 & Cone 6, not from what I could tell.
One thing I did this time that was different is I made sure to really mix the glazes better and I had the Cone 5 test tiles to put as a comparison, so I was able to see if the glaze looked good or maybe needed a little extra mixing.

And here are the mixes:
Test 1. Cone 5 Left. Cone 6 Right.
Test 2. Cone5 Left. Cone 6 Right.
Test 3. Cone 5 Left. Cone 6 Right.
Test 4. Cone 5 Left. Cone 6 Right. 
Test 5. Cone 5 Left. Cone 6 Right.
Test 6. Cone 5 Left. Cone 6 Right.
Test 7. Cone 5 Left. Cone 6 Right.
Test 8. Cone 5 Left. Cone 6 Right.
Test 9. Cone 5 Left. Cone 6 Right.
Test 10. Cone 5 Left. Cone 6 Right.
Test 11. Cone 5 Left. Cone 6 Right.
Test 12. Cone 5 Left. Cone 6 Right.
Test 13. Cone 5 Left. Cone 6 Right.
And my notebook where I've got the tests written out and numbered.
If you look on the previous post, each photo of the test has the combinations typed out.

I have plans for testing these in the large kiln to Cone 5 and Cone 6 to see if there are any differences with the larger kiln interior space and the way the heat moves within that space versus the small test kiln:
Thanks for stopping by!
Are you working on any glaze testing?


  1. Looks like a big difference between 5 and 6 to me on my monitor. I think the Cone 6 looks much better except for the amber glaze which the color looks to burn out at cone 6. A few of the overlaps look better at cone 5.

    What firing cycle do you use? I use a slow cool and it makes a big difference in the outcome of the commercial glazes I have used.

  2. Thanks – I'm must take a course to learn this stuff – Wonderful, The way you took the time comparing all the ways

  3. Your glaze testing is meticulous and is a great model for all of us. You have helped us so much with this new batch of Georgie's glazes. Thanks so much Marsha.

  4. Linda - these tests were in my small baby doll test kiln - I turned it up from Low - Med - High in about 6 to 8 hours & it was cool to the touch within 24 hours of starting it.
    I'm going to test a cone 5 & 6 in my larger computer kiln for the December post so we can compare a totally different atmosphere (larger kiln is direct vented vs little one which sits in the vented room), firing cycle (slow glaze - the preset one), and overall different heat because of the size difference.

    It's hard to tell from these first two firings if the color difference was from application variations (stirring the glaze more, applying it better) vs the actual temperature. Although you're right - some do look better at 6 than 5 and some better at 5 and burnt out at 6. But overall texture of the glaze - not much difference. I'll have to post some samples that are VERY different at 5 and 6 (have a few Amaco glazes that need that 6 or they just look under fired - similar to the above GLW10 Blue).

    I love glaze testing - it is delightful to have a bunch of new glaze combinations to try out… Hope these helps everyone when you go to order some to do your own tests.


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