Deborah Floden on sat 16 dec 00
Hello, I'm new to the list and was wondering if anyone has any recipes for
an opal blue glaze preferrably cone 6?
thanks to anyone who can help me.
Cindy Strnad on sun 17 dec 00
Deborah,
Opals come in all colors, but here's a glaze I like by that name. It
actually looks better for me at slightly less than ^6. I fire it to ^5 and
give it a 45 minute soak. At this point, ^6 has begun to bend, just barely.
Opal Blue ^5-6
25 silica
25 epk
50 frit 3134
add:
4% rutile
2% cobalt oxide
If you want to see samples of it, navigate to my webpage (link below). Most
of the blue-glazed pieces are done in this glaze.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
Chris Schafale on sun 17 dec 00
Since Cindy has posted this glaze (which I got from her), I wanted
to share some neat effects I've gotten with this base and other
colorants. I posted some time ago about looking for "runny on
purpose" glazes that will mix and feather when layered, and this
one works well that way, with the following colorants:
For base, try Floating Blue colorants (Cobalt Carb 1, RIO 2, Rutile
4, or for a brighter blue Cobalt Carb 1.25, RIO 1.5, Rutile 4.5) or try
RIO 7-10 for a nice transparent brown. Now here's the exciting
part. Mix the same base and add Rutile 5 only. Layer this over
the blue or the brown for some nifty effects. I especially got
excited about the rutile over the brown, where it breaks up and
turns blue/sorta purple/even a little pinkish as it runs. Over the
blue it just makes a lovely visually-textured light blue running down
over the darker blue. It does run significantly, so don't double-layer
this too near the bottom of your pot -- a 1/2" rim dip can turn into a
2" textured area after firing. The latter was a great seller this
holiday season, as you can imagine, being blue on blue!
I fire to 1174 C, 10 minute hold, 100 degree firedown to 950 C,
which comes out a solid cone 5 in the warmer parts of my kiln, and
on the low side of cone 5 elsewhere. I have had some blistering
when firing higher. These results were obtained on brown
stoneware -- don't know what it would look like on white clay.
Also, I calcine part of the kaolin, so I actually use 15% EPK and
8% calcined EPK. Happy testing!
Chris Schafale
who has finally started seeing teapots in the 3-D pipes
screensaver, and actually saw a golden one yesterday!
> Deborah,
>
> Opals come in all colors, but here's a glaze I like by that name. It
> actually looks better for me at slightly less than ^6. I fire it to ^5 and
> give it a 45 minute soak. At this point, ^6 has begun to bend, just barely.
>
> Opal Blue ^5-6
>
> 25 silica
> 25 epk
> 50 frit 3134
>
> add:
> 4% rutile
> 2% cobalt oxide
>
> If you want to see samples of it, navigate to my webpage (link below). Most
> of the blue-glazed pieces are done in this glaze.
>
> Cindy Strnad
> Earthen Vessels Pottery
> RR 1, Box 51
> Custer, SD 57730
> USA
> earthenv@gwtc.net
> http://www.earthenvesselssd.com
>
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>
Light One Candle Pottery
Fuquay-Varina, North Carolina, USA
(south of Raleigh)
candle@intrex.net
http://www.lightonecandle.com
Deborah Floden on mon 18 dec 00
Wow, you guys are so prompt and cool for answering so quickly. Now I have
something new to play with and I thank you both Cindy and Chris!!
Will check out your webpages!!
Thank you again.
Deborah Floden
novice potter
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