Llewellyn Kouba on sun 15 jul 07
A while back I bought a
small few lbs of Alberta Slip and would like to learn of a really good
and beautiful glaze I can best put this material to use.
Although I normally do high fired work I have been exploring the cone
6-8 range and like the results and am doing a serious of large carved
bowls, and some very big pictorial work - Madonna figures. I wouldn't
mind addition of some Alberta to some of these current works.
Llewellyn Kouba
Alisa Clausen on sat 21 jul 07
>A while back I bought a
>small few lbs of Alberta Slip and would like to learn of a really good
>and beautiful glaze I can best put this material to use.
You may want to try the red clay recipes I have tried which both come from
Lili's work and some of my own, inspired by Lili's recipes.
At my website there alisapots.dk there is a glaze page called red clay
glazes. You could sub the Alberta slip instead of what is called for in
the recipes as red clay or Alberta slip sub. Note that I made some
variations with the addition of Cobalt and/or Rutile with good results.
They are all fired at cone 6 but I although I am not looking at the
recipes right now, I would try them higher due their clay content.
HOwever they have a lot of iron, so they may run, I do not know. But if
you want to fire hotter I think they will do all right. Cone 6 is
however, enough for them.
Good luck
Alisa in Denmark
Ron Roy on mon 30 jul 07
The first two look like they would be stable glazes - the last one may not
be melted well enough to be stable - testing will tell.
I would guess they are a little high in expansion so would craze on some
clay bodies.
RR
>Floating blue from DititalFire
>
>Alberta Slip -- 80
>Frit 3134 -- 20
>plus
>Rutile -- 3 to 4
>Bentonite -- 1 (for use as a dipping glaze)
>
>Tan, floating blue, takes oxides as overglazes well.
>Matures well from ^ 5 1/2 to almost ^7. Develops a
>bit more texture with a slow cool.
>
>Write to me if it crazes; I've done some testing
>and have some alternatives to eliminate crazing
>if it's a problem on your clay.
>
>-----------------------
>
>Satin Black from Michael Redwine
>
>Alberta Slip -- 75
>Frit 3134 -- 20
>Gillespie Borate -- 5
>
>plus
>
>Cobalt Carbonate 2
>
>Slightly orange peel texture, black with
>some greenish background color.
>
>----------------------
>
>Metallic Black from Jo Ann Stevens
>
>Alberta Slip -- 85
>Nepheline Syeninte -- 5
>Wollastonite -- 10
>
>plus
>
>Cobalt Oxide -- 2
>
>Tested with cobalt carbonate 2%, black but
>not metallic at all with slow cool. Nice
>light texture. Color not too interesting.
>
>Tested with cobalt carbonate 3% and 1%
>bentonite; black and more glossy, but some
>crawling with fast cool -- still not entirely
>metallic. Not tested with slow cool; is an
>excellent overglaze over the yellow (Ian Begg's
>clear with titanium sufficient to go yellow)
>and Glossy Matte Mandy.
>
>Not yet tested with cobalt oxide.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
claystevslat on tue 31 jul 07
Ron --
True enough. I started using the floating blue when I
mainly used Bennett clay (Tacoma Clay Arts Center) but
I had crazing with the clay I mostly use now (OH-6).
My current recipe is --
Recipe Name: Gnu Blue
Cone: 6 Color: Blue over tan/brown
Firing: Oxidation Surface: Glossy
Amount Ingredient
75 Clay--Alberta Slip II
15 Gillespie Borate
5 Dolomite
4 Silica
99 Total
Additives
4 Rutile
1 Bentonite
Unity Oxide
.1 Na2O
.06 K2O
.287 MgO
.551 CaO
.002 SrO
1.000 Total
.307 Al2O3
.171 B2O3
.08 Fe2O3
2.784 SiO2
.012 TiO2
.002 P2O5
9.1 Ratio
68.4 Exp
Comments: Total adds up to 99. Might take more rutile OK. 3-4%
just a guess.
This is a variation on the DigitalFire recipe, which is 80/20
Alberta Slip to Ferro Frit 3134 plus applicable rutile.
-----------------------------------
Calculations by GlazeMaster=99
www.masteringglazes.com
------------------------------------
This looks very much like the original glaze and doesn't craze over
OH-6. (OH-6 is similar in handling characteristics to Sea Mix-5
from Seattle Pottery Supply, but has color response that is brighter
and IMO even better than B-Mix.
But this is just what I use, and DigitalFire's recipe is widely
distributed -- there're probably dozens or hundreds of potters using
the original.
As far as JoAnn Stevens' Metallic Black, it didn't get too far in
the testing process for me because it wasn't very metallic (which
I wanted) and I already had a couple of non-metallic black glazes
that worked OK. I never did testing on it, and it might not be
stable (my notes only show that it was slightly orange-peel in
texture, and it seems I never even checked it with a loupe).
Good to hear from you -- Steve Slatin
--- In clayart@yahoogroups.com, Ron Roy wrote:
>
> The first two look like they would be stable glazes - the last one
may not
> be melted well enough to be stable - testing will tell.
>
> I would guess they are a little high in expansion so would craze
on some
> clay bodies.
>
> RR
>
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