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Low Fire Friday – (My Favorite) Crawl Glaze

Meagan Chaney Gumpert - Friday, January 06, 2012
In honor of the New Year, I'm starting a new monthly feature - Low Fire Friday!!

The first friday of every month this year, I will be posting a low fire glaze/slip recipe, commercial glaze review, or other low fire related technique/product.  Some of the recipes will be my favorite standbys; some from other potters/ceramicists. I've got an exiting line up of select Guest Artists willing to share their secrets so stay tuned in the months ahead!

Hope you enjoy this new little feature. And without further delay, here's the first recipe...

(My Favorite) Crawl Glaze

This is by far my favorite Crawl Glaze. It is very reliable, but the trick is that is has to be applied THICK! And by thick, I mean super, super, think. Think cake icing application, not typical pot glazing. The thicker the application, the more it will crawl.

Crawl Glaze
- Cone 04

Gerstley Borate            46.5
Magnesuim Carbonate 31.0
EPK                            18.6
Borax                            3.9
+ Zircopax                     5.5

[beige, dark truquoise, light turquiose]

For color add...
Beige/pale yellow: + red iron oxide 1%

Dark turquoise/jade: + copper carbonate 5%

Light turquoise/jade: + copper carbonate 1%

[light turquoise]

mary commented on 24-Mar-2014 09:58 AM
thanks for the crawl recipe. i have two questions for you. one, do you blunge your borax? our studio's borax is kind of large particles. and second, have you ever tried this glaze with mason stains? i'm in the market for a bright yellow crawl.
Meagan Chaney Gumpert commented on 24-Mar-2014 01:40 PM
Hi Mary,
Thanks for reading! No. I do not blunge my borax. The particle size of what I have been using is similar to coarse sand, but still dissolves without a problem.

And yes. I have tried it with mason stains and have gotten some interesting, brighter results. It's been awhile, but I believe I was using around 10% with a Brilliant Orange and Lobster stain. (never tested a yellow.) I may have omitted the opacifier (zircopax) when using the mason stains, I honestly cannot remember now. You may want to try it either way.

Best of luck and thanks again!
nancy commented on 17-Apr-2014 03:58 PM
Would love to experiment with this crawl glaze. I glaze fire to cone 6. Any suggested recipes for that temp?? I bisque at 06.
Meagan Chaney Gumpert commented on 21-Apr-2014 03:00 PM
Hi Nancy,
I don't have a ton of experience with cone 6 and, unfortunately, have not tested this crawl glaze at that temp. My biggest suggestion would be to try substituting the Gerstley Borate with a flux that you usually use at cone 6, but I know that it wont be that simple. Gerstley Borate is a complicated, and wonderful ingredient! Just experiment and see what happens.
Best of luck to you!
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