Joyce Lee, Jim Lee on tue 16 sep 97
There are a couple of recipes for albany slip substitutes on the North
Carolina Home Pages at:
www.cclay.com/resources.htm
Just click around and you'll find many treats on these pages. For those
of you who aren't aware, there are umpteen thousand potters in North
Carolina and more moving there daily. I particularly like the Tom Gray
pottery pages although today when I tried to access his page directly, I
received the message, "URL not found." I was able to access through the
above URL, however. Good luck.
Joyce
In the Mojave waiting for the Hurricane Linda thunderstorms, as
promised. (Bite your tongue, child!)
David Hendley on fri 20 feb 98
Marshall,
I make my own Albany Slip substitute:
Redart 72
Whiting 10
Soda Feldspar 8
Talc 5
EPK kaolin 5
I can tell no difference in Rhodes Black made with this substitute
and real Albany Slip.
My 'Rhodes Black' is quite different than yours.
I've modified it over the years.
It uses much less cobalt, and manganese and iron take up the slack.
I've tried cutting back even farther on cobalt, but this seems to
be the minimum.
My Modified Rhodes Black ^10
Minspar (soda) feldspar 57
EPK 9
Redart 25
Dolomite 6.5
Whiting 2.5
Red Iron ox 5
Manganese Diox 3.7
Cobalt ox 1.3
110
This glaze is well balanced and has plenty of silica, but
with all those metals, I don't use it on food surfaces.
Re: your 'time savings tips' for glazes, why would you
put a 10 gallon plastic bag into a 5 gallon plastic pail before
filling it with a glaze material?
I use and like 3 pound coffee can for materials that are used
in small quantities. Because of the wide opening, so you can easily
scoop out material with a scoop.
David Hendley
Maydelle, Texas
See David Hendley's Pottery Page at
http://ww.sosis.com/hendley/david
At 07:48 AM 2/19/98 EST, you wrote:
>----------------------------Original message----------------------------
>I don't know how much difference there is between the three but would be
>curious to know. The glaze that I would be making up is the following:
>
>
>Rhodes Black: ^9/10 reduction:
>
>Albany Slip 75
>Neph Syenite 20
>Cobalt Oxide 5
>
>(I typically subtitute with cobalt carb and use 1.5 times more of the carb
>than the oxide) Also if you know sources and pricing for the True Albany
>Slip, I would be interested to know, however, I don't think that it is
>worth what the owners charge for it. TIA...Marshall
Ron Roy on sun 22 feb 98
Well I'm impressed David - here are 3 calculations to prove how close you
got. I am thinking that Plainsman - who produce Alberta slip - will have to
do with less profit after this - that probably suits you just fine.
By the way Tony will be at NCECA as well - good guy - we have been friends
for a long time. He is a Jehovah's witness - we were in the worlds biggest
bookstore one day and I am looking for the "fiction" section - suddenly he
says - there it is - and he's pointing to the section on evolution. Cracked
me up.
Davids albany sub
-----------------
RED ART............. 72.00 72.00%
WHITING............. 10.00 10.00%
F4 SPAR............. 8.00 8.00%
TALC................ 5.00 5.00%
EPK................. 5.00 5.00%
----------
100.00
FORMULA & ANALYSIS
------------------
*CaO........ .50 6.86%
MnO2....... .00 .01%
*MgO........ .30 2.91%
*K2O........ .16 3.68%
*Na2O....... .05 .71%
Fe2O3...... .14 5.66%
TIO2....... .04 .86%
AL2O3...... .67 16.84%
SiO2....... 4.25 62.48%
P2O5....... .00 .01%
COST/KG .83
RATIO 6.31
EXPAN 420.55
WEIGHT 408.21
My calculation from an original albany analysis.
-----------------
ALBANY.............. 100.00 100.00%
----------
100.00
FORMULA & ANALYSIS
------------------
*CaO........ .48 6.40%
MnO2....... .00 .09%
*MgO........ .30 2.92%
*K2O........ .16 3.53%
*Na2O....... .06 .88%
Fe2O3...... .15 5.74%
TIO2....... .05 .88%
AL2O3...... .66 16.11%
SiO2....... 4.44 63.44%
P2O5.......
RATIO 6.70
EXPAN 415.70
WEIGHT 419.55
Tony Hansons Alberta slip
-----------------
ALBERTA SLIP........ 100.00 100.00%
----------
100.00
FORMULA & ANALYSIS
------------------
*CaO........ .43 6.29%
MnO2.......
*MgO........ .32 3.31%
*K2O........ .13 3.09%
*Na2O....... .13 2.03%
Fe2O3...... .12 5.01%
TIO2.......
AL2O3...... .55 14.58%
SiO2....... 4.22 65.70%
P2O5.......
COST/KG 2.42
RATIO 7.66
EXPAN 427.65
WEIGHT 385.14
>----------------------------Original message----------------------------
>I make my own Albany Slip substitute:
>Redart 72
>Whiting 10
>Soda Feldspar 8
>Talc 5
>EPK kaolin 5
>
>I can tell no difference in Rhodes Black made with this substitute
>and real Albany Slip.
>
>My 'Rhodes Black' is quite different than yours.
>I've modified it over the years.
>It uses much less cobalt, and manganese and iron take up the slack.
>I've tried cutting back even farther on cobalt, but this seems to
>be the minimum.
>
>My Modified Rhodes Black ^10
>
>Minspar (soda) feldspar 57
>EPK 9
>Redart 25
>Dolomite 6.5
>Whiting 2.5
>Red Iron ox 5
>Manganese Diox 3.7
>Cobalt ox 1.3
> 110
>
>This glaze is well balanced and has plenty of silica, but
>with all those metals, I don't use it on food surfaces.
>
>Re: your 'time savings tips' for glazes, why would you
>put a 10 gallon plastic bag into a 5 gallon plastic pail before
>filling it with a glaze material?
>I use and like 3 pound coffee can for materials that are used
>in small quantities. Because of the wide opening, so you can easily
>scoop out material with a scoop.
>
>David Hendley
>Maydelle, Texas
>See David Hendley's Pottery Page at
>http://ww.sosis.com/hendley/david
>
>
>At 07:48 AM 2/19/98 EST, you wrote:
>>----------------------------Original message----------------------------
>>I don't know how much difference there is between the three but would be
>>curious to know. The glaze that I would be making up is the following:
>>
>>
>>Rhodes Black: ^9/10 reduction:
>>
>>Albany Slip 75
>>Neph Syenite 20
>>Cobalt Oxide 5
>>
>>(I typically subtitute with cobalt carb and use 1.5 times more of the carb
>>than the oxide) Also if you know sources and pricing for the True Albany
>>Slip, I would be interested to know, however, I don't think that it is
>>worth what the owners charge for it. TIA...Marshall
Ron Roy
93 Pegasus trail
Scarborough Otario
Canada M1G 3N8
Phone: 416-439-2621
Fax: 416-438-7849
Web page: Home page http://digitalfire.com/education/people/ronroy.htm
Bjorn Straube on wed 25 feb 98
Hi David,
What black ^10 glaze would you recommend to be food safe
then, or do you just not recommend any at all?
Thanks
Bjorn
Date: Fri, 20 Feb 1998 08:22:27 EST
From: David Hendley
Subject: Albany Slip substitute
My Modified Rhodes Black ^10
Minspar (soda) feldspar 57
EPK 9
Redart 25
Dolomite 6.5
Whiting 2.5
Red Iron ox 5
Manganese Diox 3.7
Cobalt ox 1.3
110
This glaze is well balanced and has plenty of silica, but
with all those metals, I don't use it on food surfaces.
Re: your 'time savings tips' for glazes, why would you
put a 10 gallon plastic bag into a 5 gallon plastic pail
before
filling it with a glaze material?
I use and like 3 pound coffee can for materials that are
used
in small quantities. Because of the wide opening, so you can
easily
scoop out material with a scoop.
David Hendley
Maydelle, Texas
See David Hendley's Pottery Page at
http://ww.sosis.com/hendley/david
Gavin Stairs on thu 26 feb 98
At 10:07 AM 2/25/98 EST, Bjorn wrote:
....
> What black ^10 glaze would you recommend to be food safe
>then, or do you just not recommend any at all?
....
At Fri, 20 Feb 1998 08:22:27 EST, David Hendley wrote:
....
>This glaze is well balanced and has plenty of silica, but
>with all those metals, I don't use it on food surfaces.
....
True Albany slip, like true tenmoku, is just a high iron clay/feldspar
based glaze. It does not result in a cold black. More like a warm, fuzzy
black. The addition of cobalt (for blue) and manganese (for deep black),
gives a cooler black. Probably the manganese could be eliminated, but then
the iron would have to be quite high. You might end up with a crystalline
iron. The cobalt could be eliminated, but then the glaze would warm up
some.
Albany used as a liner glaze was usually applied thin, and came up more
brown than black, I believe, but I'd love to hear more about this. What I
have seen that I have thought was Albany was various shades of brown, from
a light caramel to a dark chocolate. I suspect that the quarry output
varied considerably in iron content over the life of the material, perhaps
even from batch to batch. This would not have concerned the majority of
its users, who were more concerned with its glazing qualities. My
impression is that Albany was the journeyman's glaze for all of its early
history, up 'til the rise of collecting and the studio pottery movement
which continues this day. The early users would not have been as critical
of the glaze tones as we tend to be now.
Iron glazes in general have a long and varied history. Very common,
because iron is a contaminant in virtually all secondary clays. Also in
many rocks, especially sediments, those derived from basalt. The challenge
has always been to eke out the subtle colors from the iron, by exploiting
its wide range of oxidation states.
Ron Roy is a master of this iron tenmoku. I was recently priviledged to
acquire some of his latest batch. I got a mug, just because, and two
bowls, 'cause I wanted to eat off them with my lover, and a big platter.
They all show iron crystals in the deep, dark, chocolate brown areas. They
also show light breaks at the edges. The platter also has a controlled
light area in the centre with blushing of a second shade. The decoration
is a simple pattern of straws or lines in slip, which shows the whole range
in miniature on each line. In all, it is a subtle interplay of wonderful
shades of the warm, brown palette. We both love this piece. It is
beautiful. Our only worry is how to display/use it. I believe it is meant
to be used, but we don't want to cover it up! I tell you all of this to
let those of you who don't already know it that the Glaze Doctor is also a
master potter. And he also does celadon, and other glazes. But of the
work that I have seen, he is always interested in what can be done with a
balanced, durable, dependable base glaze, and a subtle alteration using
simple, natural materials, like iron, or opacifiers.
Gavin
Gavin Stairs
Toronto, Canada
Lana Reeves on tue 2 feb 99
Has anyone tried Alberta Slip, from Archie Bray foundation. It seems pretty
close to Albany to me, but I've only tried it in a few glazes.
Lana in Somerville, MA =3D=5E..=5E=3D
kilnkat=40javanet.com
=3D?iso-8859-1?B?VGlnIER1cHLp?=3D on sat 23 oct 10
Alisa and Lili=3D2C
Many thanks for the Albany Slip substitute. I know that Alberta Slip is an=
=3D
Archie Bray formulation=3D2C and must be imported from Canada=3D2C making =
it f=3D
airly expensive. Having a substitute made from readily available materials=
=3D
makes it more attractive for experimentation.
Thanks again=3D2C
Tig Dupre
in Port Orchard=3D2C WA=3D2C USA
=3D
Steve Slatin on sat 23 oct 10
Tig --
If you buy the whole-bag, at Tacoma Clay Arts it's less
than a dollar a pound. If you'd like I can drop off a
few pounds the next time I'm going through Port Orchard.
For that elusive ^6 brown glossy glaze, 80% Alberta and
20% frit 3134 works just fine.
Steve Slatin --=3D20
N48.0886450
W123.1420482
--- On Sat, 10/23/10, Tig Dupr=3DE9 wrote:
> Alisa and Lili,
>=3D20
> Many thanks for the Albany Slip substitute.=3DA0 I know
> that Alberta Slip is an Archie Bray formulation, and must be
> imported from Canada, making it fairly expensive.=3DA0
> Having a substitute made from readily available materials
> makes it more attractive for experimentation.
>=3D20
=3D0A=3D0A=3D0A
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