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Third Friday Glazing: Revisiting Previous Tests

by Marsha Neal Studio
For this month, I am re-focusing on some previous Cone 6 tests I did with a couple of Spectrum Black underglazes that I really liked (#515 and #611) and three Coyote Clay Crawl Glazes (Brown, Blue, Green).

Upper Right: Detail of area I am most interested in
Bottom Right: Focus Crawl Tiles - upper IP207, bottom UG611 both with green crawl.

I really liked some of the test tile results with the underglazes, and wanted to create some finished work using these. 
I also tried & liked the Georgies Interactive Pigment #207 on a few tests back in August - especially with the Coyote colored celadon glazes layered on top, and wanted to see how the crawl glazes worked with it. And since I just received three more of Coyote's crawl glazes in Croc, Black and White - I figured why not run some tests with them all in the same firing for better comparable results.
These pictures are the Underglaze Test Repeated.
Above = pre-firing. Below = post firing.
Square tile cut in half horizontally: top half #515, bottom half #611.
Then the crawl glazes were applied in 3-4 coats Vertically over the Underglazes:
Blue, Green, Brown, Croc, White, Black.
The rounds were done because I wanted to see the glaze reaction to the texture.

These are the IP207 test tiles - painted in the exact same way as the tiles above, except coated entirely with the IP instead of half & half:
The results were a little more "blah" than what I wanted currently.
Probably because I am so smitten with how it looks with the underglazes that these were just eh.
You never know though - this may be exactly what I need for something I can create in the future...

Want to see what I have actually made, and finished using these tested techniques?
Small finger bowl inside view (look at those patina looking cracks…)

The under-side (doesn't it look like an old rusted thing…)

And a couple of pendants good for "large" earrings or two individual pendants for necklaces.
See more "Crusty Porcelain" pieces in my Etsy Shop.
It's amazing to actually get to a point where you understand how the glaze works and you paint it on to get specific results. For as much as you can "control" your results anyway...

Here is a little visual peek at what I am working on for next month's post:
Using that IP207 with the Colored Celadons again.
I loved the first IP207 + Coyote Colored Celadon test tile.
I was confused by the first trials (which color is which?).
Frustrated at the next trials (too washed out, not enough of this watery blue/green). 
Then finally after some time away from them - have come back with new eyes…
And I am finding success…

Please leave feedback - comments, questions, requests, etc.
Have you been testing any glazes?
Want to share a link to your results?


  1. Thanks so much for showing your testing process and results. these are wonderful results, I really like what the crawl glaze does over the white under glaze and the others are great too. The one piece does look like rust and that matt patina is very nice. I have been thinking of trying some crawl glazes but never have and this prompts me to try some. I never would have thought to put an underglaze underneath, is that the color that shows through when the glaze cracks? is that the idea? I use mason stains in slip as underglaze I'm going to try some of these with those colors.

    Do you find the crawl glazes run at all? What temp did you fire to? I have a slow cool glaze fire I do with most everything, here is the link - wonder if this firing schedule would be suitable for these crawl glazes?


  2. I fired these to Cone 6. No specific speed. The glazes fit my porcelain clay body, so I have not experienced any issues with them running or crazing. They are quite thick (like yogurt consistency).

    Test, test, test… I've been fiddling with testing these since last summer.

    Seems like this post has gotten your brain going into how you can use the info for your process - would love to see you post results on the inlinkz (even if it is not this post - I do it every month).

    I wonder if the mason stains would be similar to the Interactive Pigments results. Check out my November post (linked in the post) for tests from other underglazes. This was just focusing on the results I really liked from those…

  3. I am having horrible results with the Frank's Colored Celadon Cone 5-6 Glazes! I did very quick test with them on porcelain and ugh. They feel the lack of color. Terrible. I'm not sure what I did wrong. My little electric kiln runs hot so I fired to a cone 5 - which is great for all of my other Coyote glazes but not this group. I'm going to have to test again and take more time with application - I only did two brushed coats - thinking they need three. I'm thinking it might be my porcelain. I have another porcelain that I'm going to use this time and see if I get better results. I looked at your post when you had used them alone on your porcelain and I couldn't believe how gorgeous your pieces came out compared to mine! So - retesting - hoping for better results with second porcelain.

  4. Hey Mary, Don't give up. Three coats for sure with them for more depth of color. Good choice in Cone 5 in the smaller hotter kiln (I do the same thing with certain glazes). Do you have any pics of the pieces that you are not crazy about? Would love to see them and maybe try to give some advice.

    I'm not thrilled with posting some of my bad test tiles - but I will in next months post. Nothing to be embarrassed or frustrated about. Let those go and come back to it… I like that you are going to try different clay bodies too. You'll find what works for you! Keep it up...

  5. Hi Marsha, I linked some Coyote Glaze tests. I think I may be glazing too heavy. What do you think? Love this series and how it has educated and inspired me!!


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