I am not certain of the origin of this glaze but I got it from the Prince Albert Arts Center and I believe they got it from the Saskatoon Potter's Guild.


Custer Feldspar 22

Gerstley Borate 22

Neph Syen 22

Silica 26

Wollastonite  3

EPK  3

Titanium Diox  2


Red Iron Oxide  3

Copper Carb  4

Bentonite  2


I sprayed the glaze, applying continuously and working around the piece until the glaze started to run.  This gave me a somewhat thick coat which fired to a nice glossy brown with very funky green spots.

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Thanks Kathy, I will give that a try and let you know how i go with it too. Would you recommend using this glaze on its own or over other glazes. If so, what was your preference.
I've only used it on it's own but I think it may be pretty cool over/under other glazes as well.  I like to make tiles with a scored grid on them to check out the effects of glazes under and over other glazes I use regularly.  Next time I do a glaze fire I'll try frogskin in combinations and post a photo if it's good.
Thanks for your reply Kathy. It does look great on its own, so it will be interesting to see it used with other glazes. I will have to get some Titanium Diox next time i am at my pottery supplier, but i will use it in some tests too and let you know how i go.

is this in an oxidizing, electric firing?


I fired this to cone 6 in a vented electric kiln.  Thought this is a vey cool effect for a cone 6 oxidized firing!  A thin coat gives a nice warm brown and thicker gives the speckles.

Once you get used to the conventions, basing everything on 100% makes increasing amounts very simple as for a 100 g test batch you use the same amounts, or you can increase to 500 g by multiplying all by 5 or to 1000 g by a factor of 10 or 1500 by factor of 15, etc.  The items included in the 100% are a base glaze with colorants and modifiers listed separately so they can be changed if you want to try different colours or surfaces.  I have a few glazes that give me a really cool effect such as spots and I can try to get the same effect in a different colour which gives me an infinite array of possibilities with just one base glaze.  A great example of this is Gartside base from which I've gotten great effects such as tea dust, hare's fur, small spots, crystals, etc.  I keep Gartside base mixed up dry and can test by weighing out 100 g and adding colorants and opacifiers.  I also use 50 g amounts of base and add colorants by half (you need a very accurate scale with really small amounts) to see if I am in the ballpark of the effect I want to get, without using a lot of glaze materials.  I have far to  much garbage glaze as I really like to formulate and test glazes!

I hope this hasn't just further confused the issue for you but glaze chemistry is a huge field and I've only scratched the surface. 

Thanks! I'll give it a try!


Has anyone tried reformulating this to use a frit instead of Gerstley Borate?  Any suggestions on how to reformulate it.  thanks.


     Thank you so much for this recipe! I've only done a couple of test fires so far, but it is lovely!


I may have posted some of these before. This is a great glaze! The first one is Frogskin, but I'll have to look for what i put on the rim.

On this next bottle, I don't remember what was layered over the Frogskin.

The next 2 are Frogskin on the bottle & then I refired it in a bisque.  Yep, that's all I did.   jhp

Ive wanted to try this glaze since the first post on it.  Add it to my list! nice pictures Jeff, and thanks for sharing Kathy.

I have done a little research since I posted these pics.  It says that I used "Special Sauce" on the rim on the first one.  I still don't remember what that is(No, it's not from McDonalds!).  The second bottle says it was layered with Licorice, Waterfall Brown and Magic.  The 3rd bottle which I refired in a bisque, is just layered with Magic.  Magic is a glaze that the Ceramic Shop sells.  Frogskin will go a little red when refired in a bisque, but not like you see when it was layered with Magic. I just reordered some more Magic & it is on sale in a 6 lb. bag dry.  If you just want to try it, the 8 oz. wet is only $4.00.  Not necessarily plugging the Ceramic Shop, but they do have some good glazes and you can buy them dry as well as wet.  jhp 

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