John Britt on sat 2 jul 05
Lois,
I have some listed in my book under Copper Blue.
Start with Jeff's Red, or Splotchy Lavendar, then you can try STANDARD
RED, DEPENDABLE RED, SPERRY RED, MICHAEL KOHAN'S RED, CURRIE BLACK RED,
DALY RED,or DALY RED W/TITANIUM.(to name a few)
These should all be fired to cone 10 in OXIDATION to get blue.
If you need the recipes let me know,
John Britt
President of the Glaze Free Trade Association
www.johnbrittpottery.com
Steve Irvine on sun 3 jul 05
Hi Lois,
Here is a glaze that I've been using since the '60s in both cone 8 oxidation and cone 10 reduction.
It is included in John Britt's book (a highly recommended reference for anyone working in high fire)
as "Barium 3" and there is an example of it on a teapot, pg. 97.
neph sy. 55
silica 8
epk 8
barium carb. 25
lithium carb. 4
copper carb. 3
An addition of one or two percent bentonite helps to keep it in suspension. I use this glaze on the
outside of vases, jars etc. It is semi-transparent at cone 10R, and especially nice on porcelain. An
example is the first vase on my porcelain page:
http://www.steveirvine.com/porcelain.html
As you can see, it sometimes breaks to a raspberry red colour. In wood fire it can (unpredictably!)
run the whole spectrum through orange, red, green, blue, violet. The jar at the top of this page is
an example:
http://www.steveirvine.com/page3.html
Good luck with this, let us know what you come up with when you finish your research.
Steve Irvine
Frank Colson on sun 3 jul 05
Lois- Try this on for size:
COPPER BLUE/^10 Reduction
(dry matt)
Neph Sy 112.0
Barium Carb 83.8
Lithium Carb 14.00
add 10% copper carb
I have used this fail safe glaze for 4 decades. Often I apply it to "one
fire" (no bisque) units of my hanging wall fountains. It will crawl,
shrink, flow, bubble (slightly), spot red/purple raspberry, blush pink blue
and mostly deep aqua blue. When I use it this way, I call it "
Lichen blue/green". I love the organic exuberance of the effect because I
am earth bound. If you use it on bisque it is simply a strong
consistent boring copper blue at its best.
I see that Steve's formula, below, is not far off!
Frank Colson
----- Original Message -----
From: "Steve Irvine"
To:
Sent: Sunday, July 03, 2005 8:23 AM
Subject: Re: Copper Blue Glaze at cone 10 reduction????
> Hi Lois,
>
> Here is a glaze that I've been using since the '60s in both cone 8
oxidation and cone 10 reduction.
> It is included in John Britt's book (a highly recommended reference for
anyone working in high fire)
> as "Barium 3" and there is an example of it on a teapot, pg. 97.
>
> neph sy. 55
> silica 8
> epk 8
> barium carb. 25
> lithium carb. 4
> copper carb. 3
>
> An addition of one or two percent bentonite helps to keep it in
suspension. I use this glaze on the
> outside of vases, jars etc. It is semi-transparent at cone 10R, and
especially nice on porcelain. An
> example is the first vase on my porcelain page:
> http://www.steveirvine.com/porcelain.html
> As you can see, it sometimes breaks to a raspberry red colour. In wood
fire it can (unpredictably!)
> run the whole spectrum through orange, red, green, blue, violet. The jar
at the top of this page is
> an example:
> http://www.steveirvine.com/page3.html
>
> Good luck with this, let us know what you come up with when you finish
your research.
>
> Steve Irvine
>
>
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