Ann Baker on sat 8 oct 05
I am trying to find a ^6 red glaze (oxidation) that is not in the burgundy
tones. I'd like it to be orange or tomato red. Any recipies?
William & Susan Schran User on sun 9 oct 05
On 10/8/05 9:48 PM, "Ann Baker" wrote:
> I am trying to find a ^6 red glaze (oxidation) that is not in the burgundy
> tones. I'd like it to be orange or tomato red. Any recipies?
Suggest you try the newer red inclusion stains added to a ^6 clear glaze or
use an appropriate red underglaze and apply a clear glaze over that.
Goes without saying, testing necessary.
--
William "Bill" Schran
Fredericksburg, Virginia
Snail Scott on sun 9 oct 05
At 09:48 PM 10/8/2005 -0400, you wrote:
>I am trying to find a ^6 red glaze (oxidation) that is not in the burgundy
>tones. I'd like it to be orange or tomato red. Any recipies?
The red colorants that make low-fire glazes an
orangey-red are usually cadmium, which does not
survive stoneware temperatures. For stoneware,
you will probably need to use the new zirconium-
encapsulated cadmium stains. (The zirconium
protects the cadmium from dissolution.) They are
pretty pricey, but many people are using them
successfully for this purpose.
The exact recipe isn't critical, it's the stain
that's important. If you have a recipe that is
suitable for stains and works well on your clay
body, go ahead and start there.
-Snail
Paul Lewing on mon 10 oct 05
on 10/9/05 6:26 AM, Snail Scott at snail@MINDSPRING.COM wrote:
>> I am trying to find a ^6 red glaze (oxidation) that is not in the burgundy
>> tones. I'd like it to be orange or tomato red. Any recipies?
>
> The exact recipe isn't critical,
Actually, it is. You need lots of calcium to get a really bright red from
those cadmium inclusion stains. The best base I have found for them is Tony
Hansen's 5x20 base, which has truly whacked-out amounts of calcium. And, as
other people have said, I wouldn't assume that just because the cadmium is
encapsulated in that zirconium crystal, that there's no cadmium floating
around loose. I don't think anyone really knows about that.
Paul Lewing, Seattle
John Baymore on tue 11 oct 05
Paul has given some real good advice there.
Also if you use cadmium... encapsulated or not...... and you live in the
USA... and you sell those pieces...... there are Federal FDA laws that you
need to comply with. They involve mandatory lab testing procedures and
paperwork documentation. If your studio has employees... there are OSHA
laws involved.
Keep that stuff in mind.
BTW... the TLVs and PELs for cadmium dust in the air make lead kinda' look
like oxygen and nitrogen . To my knowledge... they have not yet been
amended relative to the encapsulated materials.
best,
...............john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
JBaymore@compuserve.com
http://www.JohnBaymore.com
"Please use compuserve address for any direct communications."
| |
|
