Monday, February 21, 2011

More cone 6 test results

A lot of you in the last blog post had questions and wanted recipes so I thought rather than try answering all of them one by one I would try answering here. Above is a test tile for the selsor base oribe, it worked very nicely, lots of red flashing pretty stable
This is Woo Yellow, it was a beautiful satin matte very stable
St. Johns Black, if you want a gun metal black this is a great glaze at ^6 and ^10
VC Matte yellow, VC matte can run like a mother but it is a very pretty, not a functional glaze, use on outside with a liner glaze, sort of a stone feel, good sculpture possibilities
Marks Temmoku looked the same at ^6 as it does at ^10, this was applied a bit too thick though
Laura's Turquoise, I have used this in ^6 oxidation not as pretty as it is here. Sort of bright, but I like the feel of it, very satin matte, very stable, breaks nicely if you do a lot of carving
This was a recipe I found for a ^6 amber celedon that said ^6/7 and I think it is more on the 7 side. The inside of the bowl below shows a true amber celedon, really pretty, but it didn't all melt. Although I sort of like this look and it feels nice, not rough at all. Sort of has an ash glaze look to it.
Most of these glazes I have used in ^10 reduction and am familiar with what they do. Many of the glazes we tested were Barbara's standard ^10 glazes and we didn't alter them. You can find most of them in the John Britt high fire glaze book. I mixed up some Selsor base and added colorants and Barbara mixed up a few of the John Britt glazes like the Cherry Blossom and the buttery rust. We had much better success with her ^10 glazes, especially the Dresang Shino and the Carbon Trap shino. Here are a few recipes, but if you are really into this and want to do some testing send me an email and I will see if I can help you with at least what I have learned so far!
I think part of it is looking at the neph sy content and I am wondering if swapping out the custer feldspar for something else would melt the celedon sooner, I may try this with neph sy and see what happens. I noticed that the turquoise and the celedon both have the custer and both have a very similar feel to them. Would the turquoise get more glossy, that might be really Walmart looking, ick...... So there you have it, you know what I know, email if I can help!

Amber Celadon cone 6/7 reduction
35.0 Alberta Slip
21.4 Custer Feldspar
13.6 Silica
7.8 Whiting
2.9 Kaolin
13.6 Wollastonite
2.9 Magnesium Carbonate
2.9 Gerstley Borate

Add: 8.7 Yellow Ochre
( I think this wants to be a cone 7, and I believe it would look as nice as a ^10 amber celedon)
Selsor Base
Cone 6 Reduction
56.25 Nepheline Syenite
12.50 Gerstley Borate
10.41 Whiting
20.83 Silica
this is a nice stable clear glaze although it showed a lot of crazing, I like crazing, this had an old chinese celedon look to it and it flashed pink in places, really nice.
Laura, I tried it over the white crackle slip from Keith Phillips and it did nothing..... can't get that slip to work for me at all.

for oribe add copper carb 3.5%
for blue add rutile 5%
for a nice gray add nickel oxide and rutile (sorry I forgot the amounts, something like 1.5%)
don't even bother with the copper red, it is very muddy and ugly but if you don't want to listen to me and try for better results than I got here it is: tin oxide 1.5% copper carb .5% RIO .10%
I did notice that where it was really thick it looked like it might want to be nice, but mostly it has sucked for me both times I tried it
Liz asked for cherry blossom but I really don't like this glaze, it's fussy and it flaked off the brownstone. I used it at the workshop in Wilmington on Raku clay, it didn't flake off, but I didn't like it. This recipe looks nothing like the recipe Ronan has in his photos, it's just a rust/brown with a tiny bit of irredecsence that looks cheap to me. I did like it over VC matte which one guy did in the Wilmington workshop, very nice, but huge potential for running with that VC, use it really really thin.
cherry blossom:
neph sy 40
spdoumene 40
EPK 10
Soda Ash 10
add 2% rio for irridescent shino (sort of, but this is not the shino we all know and love)
Laura's Turquoise
36.7 Whiting
22.94 Custer Feldspar
29.36 Kaolin
9.17 Flint
1.83 Bentonite
2.98 Copper Carbonate
2.75 Rutile
.23 Cobalt Carbonate


nick friedman said...

Thanks so much for sharing all this Tracey. The glazes look great. What about those shinos? Were the glazes you mentioned unaltered from the original recipes? I use many of those Malcolm glazes, and would have thought for sure they would be dry at cone 6. Ok, now it's time to try some midrange salt...

John Bauman said...

Nice post. Great info.

I don't have a stake in it -- I'm not selling anything -- but I did stumble upon something very cool about 10-15 years ago.

There's a guy who started mining clay on his family's property near Cincinnati, OH. At Winterfair in Columbus that year, he came around to all the potter's booths and gave away samples.

OSU did some testing of his samples (I have the test numbers around here somewhere) and determined that his clay was closer than any other substitute for Albany Slip.

When I got the stuff home and tested it, suddenly some of those formulas that used to contain Albany started working again. Most notably, an old amber celadon that had long since accepted subs like Alberta, etc. All the subs merely created some version of green. Not this new Ohio Slip. Amber as true amber it was.

I used the glaze for about a year, making some of my favorite pieces ever with it. Trouble is, I couldn't give the pieces away (Everyone favors the "unglazed" pieces).

I've got a run of casseroles I'll be glazing with it tomorrow. Old glaze, new idea.

Anyway, the Ohio Slip is available and I highly recommend doing some testing with it.

cindy shake said...

WOW!! That Woo Yellow and Laura's Turquoise -holy cow those are just FAB! If I could get consistent colors like that I'd go steady with clay again :o)

Tracey Broome said...

Nick, I'll get those shino recipes for you, the tests were straight from ^10 buckets. John I have read about that slip on that person's blog and we emailed back and forth a couple of times, interesting photos on his blog, and Cindy those are pretty easy glazes. go for it!!

Dennis Allen said...

Thanks so much for the info.Once again I agree with John. Ohio Slip is a very interesting material.Gary Adkins who owns the business is a friend of mine and invited our clay club for a tour last summer.See the plant at my blog:

Kari Weaver Hopkins said...

Thanks for posting your test results. I've had some luck with a few of my ^10 R glazes fired at ^6 R. I keep testing new recipes (and trying to alter some ^10s to ^6), but never as many as you did.

I'm not in the studio much and not posting or commenting much, but I'm still reading. I'll get back in the swing. Life is just a little unsettled for me right now.

Sara Laitala said...

Diana Pancioli has some really lovely cone 6 reduction recipes available on her website as a free download, I saw them during a workshop she gave and thought they would be a great place to start with cone 6 reduction, you might like them, too.

Tracey Broome said...

Dennis your blog may be where I first heard of this clay,hey Kari, yes life is pretty unsettled around here too! and hi Sara! I had seen Diana's website before and a few of the glazes interested me, most were a little bright for my taste but she has done some hard work there!

mom2homer said...

Thanks Tracey. I'm doing a wood firing with a group this weekend, and we're going to use Ronan's CB4 as our main liner glaze; glad to see the two recipes are different!