Single Fire Test Cone 5-6 Tenmuko

[Bob Coyle]

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

[TJR]

I think you have to define your terms here. Are you saying "single fire" as in you fired it once without bisquing? Or are you saying that you glaze fired it once after bisquing. If you double fire, you glaze fired it twice. Is that correct?

Also, you need to move your iron out of the glaze recipe and place it at the bottom of the recipe, so that you can reduce the percentage of iron.

Here goes;

Flint 25

Neph 17

EPK 17

Ger Bor 8

Talc 8

Dolomite 8

Bone Ash 7

Total 90

Then you add Red Iron Ox to taste. 6% -10% for Temmoku.

TJR.

[Mark C.]

I can see why customers may feel its boo boo brown and not choose it.

Browns are fickle glazes as to selling-A little goes a long ways

I have had very good results selling glazes with Iron cystaline browns-that are almost red

I just posted one today.

Mark

[jrgpots]

Bob and Mark, how do your tenmoku glazes play with other glazes?

 

Jed

[Mark C.]

Just fine.