Comment

Comment by Norm Stuart on March 27, 2013 at 9:58pm

I made that connection when the host on UK Antiques Roadshow visited the site of the original Wedgwood factory at Fenton Stoke on Trent.

He read out entries made by Thomas Whieldon and his partner Josiah Wedgwood in their "experiment journal" trying to produce one of their first patterns.  Most notably, "Trial 132, success!" In the background of the shot was an enormous mountain of discarded ceramics.

They developed process corrections they needed to make due to changes in the humidity, temperature and air pressure - along with the variations in their raw materials.

It's far easier just to let the ceramic become what it wants and appreciate the variation as art.

Comment by Troy Bungart on March 27, 2013 at 5:54pm

That's nice. I love how a glaze recipe can be shared and not duplicated. There is so much to firing and chemical variations from bag to bag.

Comment by Norm Stuart on March 27, 2013 at 12:35pm

This is your Troy's Green Matte fired to ^6 with a faster slow-cool of 185F/hour between 1,900F and 1,500F. The surface crystallization seems more complex.

Comment by Troy Bungart on March 18, 2013 at 3:55pm

I believe the more crowded my kiln was the better this glaze turned out. In other words the slower it cooled the better. Thanks for sharing!

Comment by Norm Stuart on March 18, 2013 at 3:52pm

Thank you. I tried your Green Matte glaze in our current firing cycle. The vertical tile and a horizontal tile fired to Cone 6, 30 minute hold, 50F per hour cooling between 1,800F and 1,500F.

It's interesting how there's more crystallization from the slow-cool on the flat tile (third photo).

Comment by Troy Bungart on March 16, 2013 at 2:57am

Thanks for the share!

Comment by Norm Stuart on March 15, 2013 at 8:31pm

http://mccallsc.tripod.com/pottery-glaze-testing.html
112.0%    Warm Jade  ^6  Randy McCall
44.2%    Nepheline Syenite
25.2%    Gerstley Borate
18.9%    Silica
11.7%    Ball Clay
 5.0%    Tin Oxide
 4.0%    Rutile
 3.0%    Copper Carbonate

http://www.frogpondpottery.com/glazestability/stableglazes.html   
106.0%    Frogpond Green Mat ^6
31.7%    Kaolin--EPK
31.0%    Ferro Frit 3124
23.2%    Wollastonite
14.1%    Silica
 5.5%    Rutile Dark
 0.5%    Copper Carbonate Also up to 5%

Comment by Norm Stuart on March 15, 2013 at 8:21pm

Thanks.  I try it out tomorrow.

I still have 1/3 bag of Kona F-4.  Our studio also inherited a 50 bag of actual Albany Slip.

Finding recipes to use actual Albany Slip is harder than finding recipes for leaded glazes. I adapted an Alberta Slip recipe from Digitalfire, using tin oxide, lithium carbonate and 3195 Ferro Frit - which I imagine was not part of the original recipe.

Looking at the Albany Slip glaze on this tube tile it's tough to get excited about. I found one very old recipe to use Albany Slip to make the ugliest Tenmoku I have ever seen - on the thin tube below, it probably looks better at ^10.

Comment by Troy Bungart on March 15, 2013 at 7:34pm

Hello Norm, I like the looks of the warm jade. The frog pond green looks close to my green.

From the notes that I finally found, this started as a white glaze. This originally came from Ceramics Monthly 11-1989 page 36.

Dolomite 19.48
Gerstley Borate 12.99
Kona F-4 38.96
Flint 28.57
Zinc Oxide 12.99

I took out the Zinc Oxide and I added
Titanium Dioxide 10 percent
Black Iron Oxide 2.5 percent
Copper Carbonate 5 percent

I still have real Gerstly Borate and Kona F-4 from the 90's.

If applied to thick it runs off the foot of the pot and if applied to thin it does not develop the crystals.

Let me know how it works for you.

Comment by Norm Stuart on March 15, 2013 at 2:42pm

I'd very interested in the recipe for your frosty green glaze if you're ever so inclined.

The closest glazes I've fired are "Warm Jade", "Metallic Green", Green Dragon", or "Frog Pond Green".

Warm Jade

Metallic Green

Green Dragon

Frog Pond Green

 

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