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Bob Coyle

Member Since 06 Jun 2013
Offline Last Active Yesterday, 10:35 AM
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Topics I've Started

Single Fire Test Cone 5-6 Tenmuko

01 June 2015 - 05:25 PM

Here is a recipe for a tenmoku glaze for cone 5-6 oxidation. The glaze is very forgiving and gives good coverage when brushed at about 60% solids. It is hard to see in the pictures but there are iron red spots in the glaze.

 

I can't remember where I got this glaze... probably Roy or Cushing. I decided to try it as a single fire glaze to see how it compared with bisque fired. I brushed it on the leather hard clay and let it dry, then fired it with the ordinary cone 5 cycle I use.

 

I really couldn't see any difference between the two types of glaze applications. I use MR-5 and Speckled Buff from Laguna. I thought the Speckled buff might give me a different surface, but it didn't

 

I don't make table ware so I don't know how this would hold up. There is nothing much in it that should cause toxicity problems.

 

I really like the appearance of this glaze, but my customers don't. Pots with this glaze seem to sell last, so I backed off of using it mostly. I made some up for a class and ran these test tiles to see how a single fire would work.

 

Component      %

Flint               25

Neph Sy         17

EPK               17

RIO               10

Gerstly Borate 08

Talc               08

Dolomite        08

Bone Ash       07


Single Fire Test Cone 5-6 Tenmuko

01 June 2015 - 05:23 PM

Here is a recipe for a tenmoku glaze for cone 5-6 oxidation. The glaze is very forgiving and gives good coverage when brushed at about 60% solids. It is hard to see in the pictures but there are iron red spots in the glaze.

 

I can't remember where I got this glaze... probably Roy or Cushing. I decided to try it as a single fire glaze to see how it compared with bisque fired. I brushed it on the leather hard clay and let it dry, then fired it with the ordinary cone 5 cycle I use.

 

I really couldn't see any difference between the two types of glaze applications. I use MR-5 and Speckled Buff from Laguna. I thought the Speckled buff might give me a different surface, but it didn't

 

I don't make table ware so I don't know how this would hold up. There is nothing much in it that should cause toxicity problems.

 

I really like the appearance of this glaze, but my customers don't. Pots with this glaze seem to sell last, so I backed off of using it mostly. I made some up for a class and ran these test tiles to see how a single fire would work.

 

Component %

Flint 25

Neph Sy 17

EPK 17

RIO 10

Gerstly Borate 08

Talc 08

Dolomite 08

Bone Ash 07


A Couple Of Cone 05 Glaze Tests

02 July 2014 - 05:51 PM

here are  a couple of glaze tests I ran the other day fired to cone 05 on a stoneware body.

the ramp held at 1150F for 30 min then to 1700F at 500/hr then to shutoff at 125/hr to cone 05 with a kiln sitter.

 

Sample tiles have a black line drawn on the bisque ware and on top of the glaze to show slump and transparency. Glaze is brushed on with a second coat on the left side.  I added talc to the standard "Jacky" glaze formula to get a little more hide and matte. The G20805 is not modified.

 

Flecks in the glaze are unmixed pigments, since I just mixed them into the base mix  and did not attempt to completely blend

Jacky Mod 4

Flint                      41.65
Gerstley borate      27.58
Nepheline syenite  10.84
Lithium carbonate   9.51
Talc                       5.66
EPK                      4.76

 

G2805 Cone 04-06 Matte

Frit 3134             44
Dolomite              8
Kaolin                12
Whiting                8
Silica                  28