nancy sproul on sun 4 jul 99
Hi Clayarters,
This question is for Ron Roy or other glaze gurus. I was mixing a 4000 grm
batch of Emily Purple (from the Penland book) which is a nice cobalt ^9
glaze I use a lot when the phone rang. After I got off the phone I was
confused about what I had or had not added to the glaze. I went ahead and
finished mixing the glaze the best I could, but ran tests since I didn't
trust myself. The glaze fires cobalt blue with purple crystals. I'm doing a
slow cooling but the original glaze does not have the light purple crystals.
The glaze is as follows:
Potash Spar 410
Colemanite 120
Dolomite 70
Talc 150
Tenn Ball Clay 50
Flint 200
Total 1000
Blue: 3% Cobalt Carbonate
2% Tin Oxide
I was near the Dolomite when I was interupted, but had dumped the chemical
and not changed the scale. Could I have doubled the Dolomite or possibly
reduced the Talc? Any ideas would be appreciated. I can't remember who
says "she learns from her mistakes" but I would sure like to reproduce this
one!
Nancy in South Carolina where we had 12 inches of rain on Tuesday!
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Jeremy/Bonnie Hellman on tue 6 jul 99
Nancy,
I understand that you have asked a different question, but since after
having the same problem with "remembering" where I was when making up a
glaze, I started adding another process to my glaze making.
I ALWAYS keep a pencil nearby when making my glazes. After adding EACH
ingredient, I place a small check mark next to that ingredient. Often I
re-write the ingredients with the quantity I will be using on a separate
page. And if I need to weigh an ingredient in 2 or more batches, I write
it out that way so I can check off EACH weighing.
For example, if I were using 1640 grams of potash feldspar, I'd probably
write "820 spar" and "820 spar", so I could make my mark after the first
820 grams were weighed. My triple balance has a hard time holding 1640
grams at once!
It's just too easy to get distracted, especially when there are a lot of
white and light colored powders in use at the same time! I hope you get
your answer about how to get your purple crystals in the blue glaze.
Bonnie
Bonnie Hellman still on vacation in Ouray, CO, enjoying the low humidity
and comfortable temperatures
>----------------------------Original message----------------------------
>
>Hi Clayarters,
>
>This question is for Ron Roy or other glaze gurus. I was mixing a 4000 grm
>batch of Emily Purple (from the Penland book) which is a nice cobalt ^9
>glaze I use a lot when the phone rang. After I got off the phone I was
>confused about what I had or had not added to the glaze. I went ahead and
>finished mixing the glaze the best I could, but ran tests since I didn't
>trust myself. The glaze fires cobalt blue with purple crystals. I'm doing a
>slow cooling but the original glaze does not have the light purple crystals.
> The glaze is as follows:
>
>Potash Spar 410
>Colemanite 120
>Dolomite 70
>Talc 150
>Tenn Ball Clay 50
>Flint 200
>
>Total 1000
>
>Blue: 3% Cobalt Carbonate
> 2% Tin Oxide
>
>I was near the Dolomite when I was interupted, but had dumped the chemical
>and not changed the scale. Could I have doubled the Dolomite or possibly
>reduced the Talc? Any ideas would be appreciated. I can't remember who
>says "she learns from her mistakes" but I would sure like to reproduce this
>one!
>
>Nancy in South Carolina where we had 12 inches of rain on Tuesday!
>
Corinne P. Null on wed 7 jul 99
I use a similar method as Bonnie's, but instead of a pencil, I keep 4 fired
cone packs by my scale. After I add each 600 grams (max. my scale will
hold), I move a cone pack to the "accomplished" area, sort of like an
abacus. Figure I'll always know which ingredient I was working on, but then
again, now that I think of it, maybe I'll create a marker for which bag I
was working out of - like an empty bucket to place over the opening or
something....Thanks for making me think about it more!
Corinne Null, Studio Potter
Bedford, New Hampshire
null@mediaone.net
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.UKY.EDU]On Behalf
Of Jeremy/Bonnie Hellman
Sent: Tuesday, July 06, 1999 9:11 AM
To: CLAYART@LSV.UKY.EDU
Subject: Re: glaze mistake--can I repeat it?
----------------------------Original message----------------------------
Nancy,
I understand that you have asked a different question, but since after
having the same problem with "remembering" where I was when making up a
glaze, I started adding another process to my glaze making.
I ALWAYS keep a pencil nearby when making my glazes. After adding EACH
ingredient, I place a small check mark next to that ingredient. Often I
re-write the ingredients with the quantity I will be using on a separate
page. And if I need to weigh an ingredient in 2 or more batches, I write
it out that way so I can check off EACH weighing.
For example, if I were using 1640 grams of potash feldspar, I'd probably
write "820 spar" and "820 spar", so I could make my mark after the first
820 grams were weighed. My triple balance has a hard time holding 1640
grams at once!
It's just too easy to get distracted, especially when there are a lot of
white and light colored powders in use at the same time! I hope you get
your answer about how to get your purple crystals in the blue glaze.
Bonnie
Bonnie Hellman still on vacation in Ouray, CO, enjoying the low humidity
and comfortable temperatures
>----------------------------Original message----------------------------
>
>Hi Clayarters,
>
>This question is for Ron Roy or other glaze gurus. I was mixing a 4000 grm
>batch of Emily Purple (from the Penland book) which is a nice cobalt ^9
>glaze I use a lot when the phone rang. After I got off the phone I was
>confused about what I had or had not added to the glaze. I went ahead and
>finished mixing the glaze the best I could, but ran tests since I didn't
>trust myself. The glaze fires cobalt blue with purple crystals. I'm doing
a
>slow cooling but the original glaze does not have the light purple
crystals.
> The glaze is as follows:
>
>Potash Spar 410
>Colemanite 120
>Dolomite 70
>Talc 150
>Tenn Ball Clay 50
>Flint 200
>
>Total 1000
>
>Blue: 3% Cobalt Carbonate
> 2% Tin Oxide
>
>I was near the Dolomite when I was interupted, but had dumped the chemical
>and not changed the scale. Could I have doubled the Dolomite or possibly
>reduced the Talc? Any ideas would be appreciated. I can't remember who
>says "she learns from her mistakes" but I would sure like to reproduce this
>one!
>
>Nancy in South Carolina where we had 12 inches of rain on Tuesday!
>
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