Glazes - Randy's/Toby's Red

Has anyone tried using the recipe for the cone6 oxidation red glaze (goes by
many names but is essentially the following recipe) that uses a frit rather
than gerstley? If so, are you happy with it? I haven't run out of gerstley
yet but I keep on planning to wean myself away from it and this is one glaze
I can't do without.

Gerstley Borate 3200
Flint 3000
Feldspar--Kona F4 2000
Talc 1400
Kaolin--EPK 500
Iron Oxide--Red 1515

Any glaze I've tried (Or have seen tried) that substitutes frit for GB just
doesn't meet muster.

I'm not familiar with the #'s next to the glaze components. Could you
kindly provide either an explanation of the quantities, or the 100%+
formulas I'm used to? Thank you so much. I'm anxious to try a ^6 red.

--
Jimmy Greene
Santee, CA / Lake Oswego, OR

On Sat, 2 Sep 2006 12:12:05 -0400, "DKat"
wrote:

Has anyone tried using the recipe for the cone6 oxidation red glaze (goes by
many names but is essentially the following recipe) that uses a frit rather
than gerstley? If so, are you happy with it? I haven't run out of gerstley
yet but I keep on planning to wean myself away from it and this is one glaze
I can't do without.

Gerstley Borate 3200
Flint 3000
Feldspar--Kona F4 2000
Talc 1400
Kaolin--EPK 500
Iron Oxide--Red 1515



What about Gillespie Borate? It's supposed to be a direct
substitute for Gerstley. I can't do a direct comparison myself
since I don't have any Gerstley. I have not had much luck
with red recipes in general, and I think it may be due to my
tiny kiln cooling too fast. But I will give this a try and report
back.

Best regards,



Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator

Those are grams (total of 10,000 in the original recipe with Iron Oxide
being 15%). Various people have tweaked it but it is always near what you
see. If you want it converted to lbs let me know and tell me what amount
you want. This fills a 5 gallon bucket more or less.

FYI http://digitalfire.com/gerstleyborat...ironreds.shtml

Gerstley Borate 3200
Flint 3000
Feldspar--Kona F4 2000
Talc 1400
Kaolin--EPK 500
Iron Oxide--Red 1515

"JimmyG" wrote in message
news:8azKg.6306$rT5.3739@fed1read01...
Any glaze I've tried (Or have seen tried) that substitutes frit for GB
just doesn't meet muster.

I'm not familiar with the #'s next to the glaze components. Could you
kindly provide either an explanation of the quantities, or the 100%+
formulas I'm used to? Thank you so much. I'm anxious to try a ^6 red.

--
Jimmy Greene
Santee, CA / Lake Oswego, OR

I think slow cooling is critical to this recipe being consistently red (put
it in the center of the kiln?). Oddly it also improves with 'aging'.
Perhaps FeO going to FeO2? I like this recipe a lot but it can be a real
ugly brown if too thin or if the crystals don't develop. If you do
something like a bowl, you will notice that the inside is nicer than the
outside (I'm guess both thickness and cooling play a part here). It takes
the 'Special' red iron oxide not the Spanish. Spanish give a brown glaze.
The red is a very earthy red - not Target red. I thought digital fire
compared the typical oxidation iron red done with both Gerstley and
Gillespie but I now can't find it and the site looks different.

http://digitalfire.com/gerstleyborat...ironreds.shtml
http://www.ceramicsmonthly.org/mustr...stitutions.asp


"Bob Masta" wrote in message
...
On Sat, 2 Sep 2006 12:12:05 -0400, "DKat"
wrote:

Has anyone tried using the recipe for the cone6 oxidation red glaze (goes
by
many names but is essentially the following recipe) that uses a frit
rather
than gerstley? If so, are you happy with it? I haven't run out of
gerstley
yet but I keep on planning to wean myself away from it and this is one
glaze
I can't do without.

Gerstley Borate 3200
Flint 3000
Feldspar--Kona F4 2000
Talc 1400
Kaolin--EPK 500
Iron Oxide--Red 1515



What about Gillespie Borate? It's supposed to be a direct
substitute for Gerstley. I can't do a direct comparison myself
since I don't have any Gerstley. I have not had much luck
with red recipes in general, and I think it may be due to my
tiny kiln cooling too fast. But I will give this a try and report
back.

Best regards,



Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator