Comment

Comment by Catherine Rehbein on May 15, 2011 at 7:20am

Sorry George I failed to see your statement below ....this is 2 glazes..This one is tempting me to once again experiment with my own mixing!  Nice!

Comment by Catherine Rehbein on May 15, 2011 at 7:15am

Beautiful Glaze effects George! Is this several glazes or just one?

Comment by Sharon Ivy on April 2, 2011 at 10:05pm

I very much like the old, weathered, patina-look on this mug.

Comment by George Lewter on October 9, 2009 at 4:23pm

I don't use any blue, & no cobalt. The blue just arises from the interaction of Floating Red over Waxwing brown. The floating red elicited quite a bit of scorn on the Clayart archives, because it is so low in mainly alumina but also silica, that people said it really isn't a glaze at all! What they are not understanding is the rather magical qualities of Boron. If you think of Gerstely Borate only as a source of flux that point of view holds up. But borates are also glass formers, and are R2O3 components like alumina. I find the glaze reasonably hard, and resistant to acid etching. It goes wildy different colors on the same pot with no other glaze and is quite different over a white body compared to a high iron body - where it goes blue/black where thin.

Recipe Name: Floating Red

Cone: 6 Color: multicolored w iron red
Firing: Oxidation Surface: Glossy

Amount Ingredient
55 Gerstley Borate--1999
15 Talc
30 Silica

100 Total

Additives
15 Iron Oxide--Red

Unity Oxide
.077 Na2O
.323 MgO
.601 CaO
1.000 Total

.112 Al2O3
.587 B2O3
.001 Fe2O3

2.4 SiO2

21.5 Ratio
5.7 Exp

Comments: Note very low alumina and low silica -- low durability
U. Texas Permian Basin recipe. Only recipe I have that has produced a really good iron red.
Fairly runny glaze that produces the reds where it pools the thickest. Best results during a crash cool and a 1 hour hold at 1745F then natural cooling rate. But it also worked fairly well with a slow cool to that temp when I wanted to develop matts in other glazes
Clayart discussions have references to replacing half of the gerstely borate with feldspar. Ive saved that as Floating Red II.
Another suggested variation was to back the GB off to 45 and add 10% EPK. Claimed this kept color and made glaze less runny.
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Calculations by GlazeMaster™
www.masteringglazes.com
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Comment by Zoophagous on October 9, 2009 at 3:27pm

Very nice. I've never been able to combine an iron red with a blue without it looking awful. What blue are you using?