Linda Stauffer on thu 10 nov 11
I had the weirdest thing happen to a glaze this week. Last year I bought Bl=
u=3D
e Shino glaze from Coyote. One of my students was stirring up the glaze and=
b=3D
rought me something she found in the bucket. It was a huge hexagonal cryst=
a=3D
l, about 1.5" across and an inch thick. Last year I found some tiny crystal=
s=3D
in it. I usually mix all my own glazes and this has never happened before=
.=3D
I called Coyote and they said if this particular glaze temp goes below 65 =
d=3D
egrees F. Crystals form. I've never heard of this! Can anyone explain what =
h=3D
appened? What was the crystal?
Linda P. Stauffer
Linda P. Stauffer
=3D
Linda Stauffer on fri 11 nov 11
Yes, my crystal is the same as the big one pictured on your link. Thanks fo=
r=3D
the info.=3D20
Linda P. Stauffer
On Nov 11, 2011, at 8:00 AM, John Britt wrote:
> http://www.ceramicstoday.com/articles/flambe_magic.htm
>=3D20
> johbrittpottery.com
>=3D20
Pottery by John on fri 11 nov 11
I have crystals form in my Rick Berman Turquoise raku glaze that I am told
are Borate crystals. I plan to harvest a few and put them on a glazed pot
and see if I can get some of John Britt's flambe' magic going. John wrote
about it here: http://johnbrittpottery.com/writings/articles/flambe-magic/
John Lowes
Sandy Springs, Georgia
http://wynhillpottery.weebly.com/
----- Original Message -----
From: "Linda Stauffer"
To:
Sent: Thursday, November 10, 2011 9:08 PM
Subject: Crystal formation in glazes
I had the weirdest thing happen to a glaze this week. Last year I bought
Blue Shino glaze from Coyote. One of my students was stirring up the glaze
and brought me something she found in the bucket. It was a huge hexagonal
crystal, about 1.5" across and an inch thick. Last year I found some tiny
crystals in it. I usually mix all my own glazes and this has never happene=
d
before. I called Coyote and they said if this particular glaze temp goes
below 65 degrees F. Crystals form. I've never heard of this! Can anyone
explain what happened? What was the crystal?
Linda P. Stauffer
Linda P. Stauffer
=3D
John Britt on fri 11 nov 11
http://www.ceramicstoday.com/articles/flambe_magic.htm
johbrittpottery.com
Richard White on fri 11 nov 11
Linda, that was a nice honkin' big crystal of lithium carbonate. You have=
=3D
2
choices - keep it as an interesting souvenir, but as you know from making=
=3D
your own glazes, the absence of that much LiCO3 from the recipe will chan=
=3D
ge
the outcome of the fired glaze. Or, put it in a baggie and smash it with =
=3D
a
hammer. Now take all the crushed crystals with a few cups of the glaze
slurry and microwave it until it is hot enough to re-dissolve the Li. The=
=3D
n
mix it back into the rest of the bucket. Sieve it, both to thoroughly mix=
=3D
it
and to get any remaining Li crystals. If so, rinse and repeat.
dw
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