Fara Shimbo on thu 12 may 05
Okay, so here's my dilemma. I've got a whole stack of transparent
red glass. Crimson glass and scarlet glass and true red and it's
all absolutely transparent. But I have never, ever, seen a transparent
red glaze. Come to think of it, I don't think I've seen a transparent
orange glaze either.
I decided to heat up some of the red glass in the kiln to make
some beads. All my transparent glass turned opaque!
"Feh!" said I. I want a nice, completely transparent, true red glaze.
Are there no such things? If there can be such glass, it stands
to (my) reason there ought to be a transparent red glaze. If
there isn't already a transparent red glaze, where do I start to
try to develop one?
HELP!
Fa
--
=============================================================
Fara Shimbo, Master Crystalliere, Certified Public Nuisance
-------------------------------------------------------------
Shimbo Pottery, PO Box 41, Hygiene, CO 80533 USA 718.210.3492
Crystalline-Ceramics.Info ShimboPottery.com Crystallieri.Org
Klysadel.Net TuranianHorse.Org
=============================================================
Bruce Girrell on thu 12 may 05
Fara Shimbo wrote:
> I have never, ever, seen a transparent red glaze.
But isn't that what copper red is?
Bruce Girrell
who has tried, but never gotten more than a tease of copper red
jesse hull on thu 12 may 05
Bruce,
Most of the copper reds I've seen are pretty opaque...
~jessehull.
www.jessehull.com
www.latticestructures.com
william schran on thu 12 may 05
Fa wrote:>If there can be such glass, it stands
to (my) reason there ought to be a transparent red glaze. <
Take a look at these web sites to give you some insights:
http://1st.glassman.com/articles/glasscolouring.html
http://www.glassnotes.com/culletcolor.html
Bill
Cynthia Bracker on thu 12 may 05
What about mixing a red stain into a clear glaze? Spectrum's new reds
come in a stain as well ($7.00 for a 1/4 pound - sorry, not up on our
website yet). The tricky thing is that the glaze would need to have
essentially NO boron.
Cindy Bracker
Fara Shimbo wrote:
> Okay, so here's my dilemma. I've got a whole stack of transparent
> red glass. Crimson glass and scarlet glass and true red and it's
> all absolutely transparent. But I have never, ever, seen a transparent
> red glaze. Come to think of it, I don't think I've seen a transparent
> orange glaze either.
>
> I decided to heat up some of the red glass in the kiln to make
> some beads. All my transparent glass turned opaque!
>
> "Feh!" said I. I want a nice, completely transparent, true red glaze.
> Are there no such things? If there can be such glass, it stands
> to (my) reason there ought to be a transparent red glaze. If
> there isn't already a transparent red glaze, where do I start to
> try to develop one?
>
> HELP!
>
> Fa
> --
> =============================================================
> Fara Shimbo, Master Crystalliere, Certified Public Nuisance
> -------------------------------------------------------------
> Shimbo Pottery, PO Box 41, Hygiene, CO 80533 USA 718.210.3492
> Crystalline-Ceramics.Info ShimboPottery.com Crystallieri.Org
> Klysadel.Net TuranianHorse.Org
> =============================================================
>
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--
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Bracker's Good Earth Clays, Inc.
1831 E 1450 Road
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TOLL FREE: 1-888-822-1982
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Lee Love on fri 13 may 05
Bruce Girrell wrote:
>But isn't that what copper red is?
>
>
Bruce, my teacher's copper red has opaque spots. His technique is to put
down a layer of feldspathic glaze, then coat this with copper slip and
then coat the copper with more clear glaze. What I like about this is
that sometimes the copper breaks through metallic. Makes it feel more
"earthy." You can see an example here: http://claycraft.blogspot.com/
--
李 Lee Love 大
愛 鱗
in Mashiko, Japan http://mashiko.org
http://hankos.blogspot.com/ Visual Bookmarks
http://ikiru.blogspot.com/ Zen and Craft
jesse hull on fri 13 may 05
Interesting, it hardly looks like a copper red at all.
Resembles more of the Ohata/Oharata iron saturate
glazes I played with back in school.
~jessehull.
Jon Pacini on fri 13 may 05
Greetings All -- Hi Fa----
I got on the phone with my resident Glass guru this morning--Jon Bush ---
and according to Jon, he makes copper red glass from what is called Nuetral
batch, red copper ox, tin ox and sugar.
Nuetral batch as he described it has no 'Oxidizers' in it. This is 'glass
speak' and I'm not sure what it means from a ceramics point of veiw. But in
looking at a formula for "nuetral glass" what you have is silica, soda ash,
whiting and a dash of lithium, zinc and barium.
He said you have to use red copper ox and it's best not to reduce it or over
"burn it" or it turns livery or black. Appearently the sugar is the reducing
agent. He also suggested it be made in a pot furnace rather than an open
furnace. More 'glass speak'.
It all sounds like some kind of black magic to me---but he's the Pro From
Dover, I'm just an ol' potter.
Best regards,
Jon Pacini
Clay Manager
Laguna Clay Co
Lee Love on sat 14 may 05
jesse hull wrote:
>Interesting, it hardly looks like a copper red at all.
> Resembles more of the Ohata/Oharata iron saturate
>glazes I played with back in school
>
>
Hi Jesse,
Yes, it is a little like it. But there are interesting qualities that
give the technique some "earthiness." I usually don't like copper red
and have limited it to decoration, but I like this technique, of
sandwiching the oxide between layers of feldspathic glaze. Shimaoka also
does it with gosu (impure cobalt) and tetsu (iron oxide.) These are
wonderful too, the cobalt having a warm feeling and the iron often going
purple.
I looked in my catalogs and can't find gosu and tetsu examples, but I
did find a better Sensha pot, one that breaks through metallic more:
http://claycraft.blogspot.com/
--
李 Lee Love 大
愛 鱗
in Mashiko, Japan http://mashiko.org
http://hankos.blogspot.com/ Visual Bookmarks
http://ikiru.blogspot.com/ Zen and Craft
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