millenial_age on mon 9 sep 02
I am looking for something that will give the deep blue look of
Cobalt Oxide and Cobalt Carbonate but have yet to find anything
cheaper.
Does anyone know of an alternative to the very expensive cobalt
materials or a place to get them at a cheap price?
I recently made:
Ball Clay 50%
Kaolin 50%
Add:
Cobalt oxide 4%
Cobalt Carbonate 7%
And while the blue is great!!!!! it is an expensive formula. I apply
it to wet greenware and then use a clear glossy glaze over it.
June Perry on mon 9 sep 02
I think you're wasting cobalt by using so much in a slip! If the numbers you
wrote (which add up to about 11%), that is way too high even for a slip or
engobe.
Why not use the cobalt in a glaze, then you'd only need about 1-3% cobalt
oxide, depending on your base glaze, to give you a deep blue. With that
smaller percentage it wouldn't be expensive when you calculate the small
amount of cobalt in each glazed pot.
Rutile in reduction and in the right base, can give deep blues, but they may
not be the tone you want.
Regards,
June Perry
Pat Southwood on mon 9 sep 02
Dear Millenial,
I am sure others will help you much further than me but this is VERY heavy
on oxides, you appear to be using them as a flux . Cobalt is an incredibly
strong oxide and you should cut down, for the sake of your wealth!
What clay are you using?
What temp. are you firing to,?
Knowing that will help other people to help you with less expensive stuff,
good luck
Pat.
----- Original Message -----
From: "millenial_age"
To:
Sent: Monday, September 09, 2002 2:44 PM
Subject: Cobalt Blue - An Inexpensive Alternative?
> I am looking for something that will give the deep blue look of
> Cobalt Oxide and Cobalt Carbonate but have yet to find anything
> cheaper.
>
> Does anyone know of an alternative to the very expensive cobalt
> materials or a place to get them at a cheap price?
>
> I recently made:
>
> Ball Clay 50%
> Kaolin 50%
>
> Add:
> Cobalt oxide 4%
> Cobalt Carbonate 7%
>
> And while the blue is great!!!!! it is an expensive formula. I apply
> it to wet greenware and then use a clear glossy glaze over it.
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
David Hendley on mon 9 sep 02
How to save money and still have a blue glaze:
1. Use the cobalt in a glaze, not in a slip that is covered with a
clear glaze. Slips require much more colorant than glazes to make
the same depth of color.
2. Use cobalt oxide, not cobalt carbonate. Although oxide is more
expensive per pound, it is less expensive per "blue color supplied".
Use carbonate only if the cobalt oxide causes specks of dark blue
in a pale blue glaze, as it can tend to do.
3. Make your own blue frit by breaking and ball milling blue bottles.
Blue bottles are not common, but not rare. Common "finds" are
Arizona Iced Tea "Memory Formula", various wines, Skyy vodka,
and the new Skyy vodka "malt beverage" that comes in 6-packs.
I estimate the composition of the blue bottle frit as:
1.00 fluxes, mainly sodium
.05 alumina
2.80 silica
plus about 1% pure cobalt.
4. Forget the cobalt and use a rutile blue glaze. About 3% rutile
or titanium can make a beautiful blue glaze. Rutile blue glazes
require more study and care in formulation and firing, but are
a great alternative to cobalt blue glazes.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
----- Original Message -----
From: "millenial_age"
> I am looking for something that will give the deep blue look of
> Cobalt Oxide and Cobalt Carbonate but have yet to find anything
> cheaper.
> Does anyone know of an alternative to the very expensive cobalt
> materials or a place to get them at a cheap price?
>
> I recently made:
> Ball Clay 50%
> Kaolin 50%
> Add:
> Cobalt oxide 4%
> Cobalt Carbonate 7%
John Kimpton Dellow on tue 10 sep 02
you don`t give a temp so why not have try of a boron blue in the
mid fire range.
C02-04
Frit 938 60
Frit 4712 24
Kaolin 6
Silica 8
Copper Oxide 2
---
100
Frit 938
0.49 CaO 0.25 Al2O3 3.00 SiO2
0.11 BaO 0.62 B2O3
0.11 ZnO
0.29 (NaK)O
Frit 4712
0.60 CaO 0.35 Al2O3 3.50 SiO2
0.40 Na2O 0.65 B2O3
millenial_age wrote:
>
> I am looking for something that will give the deep blue look of
> Cobalt Oxide and Cobalt Carbonate but have yet to find anything
> cheaper.
John Dellow "the flower pot man"
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
Ababi on wed 11 sep 02
Since I read in a letter to clayart about zinc-nickel connection I found it very
interesting.
Try any zinc based recipe ad to it 1-3 nickel oxide, in ^6 it can give you blue. I said
can, because you must test first.
If it does make another test add to the successful recipe 5 titanium and get lovely
lemon yellow greens.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
---------- Original Message ----------
>How to save money and still have a blue glaze:
>1. Use the cobalt in a glaze, not in a slip that is covered with a
>clear glaze. Slips require much more colorant than glazes to make
>the same depth of color.
>2. Use cobalt oxide, not cobalt carbonate. Although oxide is more
>expensive per pound, it is less expensive per "blue color supplied".
>Use carbonate only if the cobalt oxide causes specks of dark blue
>in a pale blue glaze, as it can tend to do.
>3. Make your own blue frit by breaking and ball milling blue bottles.
>Blue bottles are not common, but not rare. Common "finds" are
>Arizona Iced Tea "Memory Formula", various wines, Skyy vodka,
>and the new Skyy vodka "malt beverage" that comes in 6-packs.
>I estimate the composition of the blue bottle frit as:
>1.00 fluxes, mainly sodium
>..05 alumina
>2.80 silica
>plus about 1% pure cobalt.
>4. Forget the cobalt and use a rutile blue glaze. About 3% rutile
>or titanium can make a beautiful blue glaze. Rutile blue glazes
>require more study and care in formulation and firing, but are
>a great alternative to cobalt blue glazes.
>David Hendley
>Maydelle, Texas
>hendley@tyler.net
>http://www.farmpots.com
>----- Original Message -----
>From: "millenial_age"
>> I am looking for something that will give the deep blue look of
>> Cobalt Oxide and Cobalt Carbonate but have yet to find anything
>> cheaper.
>> Does anyone know of an alternative to the very expensive cobalt
>> materials or a place to get them at a cheap price?
>>
>> I recently made:
>> Ball Clay 50%
>> Kaolin 50%
>> Add:
>> Cobalt oxide 4%
>> Cobalt Carbonate 7%
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Janet Kaiser on wed 11 sep 02
Did anyone follow up the "recipe" or use similar methods to those mentioned
in National Geographic? Was it last month?
Janet Kaiser
The Chapel of Art =95 Capel Celfyddyd
8 Marine Crescent, Criccieth LL52 0EA, Wales, UK
Tel: 01766-523570 URL: http://www.the-coa.org.uk
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