Earl Krueger on sat 27 sep 03
So, I'm sitting here today trying to get ahead of the
curve on the work I get paid to do (non-pottery)
when my wife comes in and says "Are you interested
in an analytical balance, the kind that weighs to
fractions of a milligram? There's one down
the road at a yard sale for $10."
AM I ??? YOU BET !!!
So, I can now make up 1 gram glaze tests with an
accuracy of at least one part per thousand.
Anybody done this? Any value to doing it?
Any special research of interest that
requires this kind of accuracy?
Earl...
Bothell, WA
David Beumee on sun 28 sep 03
> Anybody done this? Any value to doing it?
> Any special research of interest that
> requires this kind of accuracy?
I do not see the value of making 1 gram glaze tests, even if you have the
scale to do it accurately. I made 200 gram glaze tests for many years, which
makes enough glaze to dip a test tile or "mouse", and the triple beam is
accurate enough to weigh out fractions of a percentage of colorant for a 200
gram batch. But I have taken to mixing 400 gram batches in the last few years,
because 400 grams can be mixed using a blender without throwing the contents
unmixed against the side of the blender, as happens with 200 grams batches.
Also 400 grams makes enough glaze so that if the test turns out to be
interesting, I have enough glaze to pour or even dip a tiny piece without
having to make the glaze over. Remember there is always a difference between
the look of a glaze on a test tile and the look of a glaze on an actual piece.
Then if the tiny piece looks great and the glaze isn't a runner, I mix a
larger quantity. The progression takes time, but I end up not wasting alot of
materials.
David Beumee
Earth Alchemy Pottery
Lafayette, CO
> So, I'm sitting here today trying to get ahead of the
> curve on the work I get paid to do (non-pottery)
> when my wife comes in and says "Are you interested
> in an analytical balance, the kind that weighs to
> fractions of a milligram? There's one down
> the road at a yard sale for $10."
>
> AM I ??? YOU BET !!!
>
> So, I can now make up 1 gram glaze tests with an
> accuracy of at least one part per thousand.
>
> Anybody done this? Any value to doing it?
> Any special research of interest that
> requires this kind of accuracy?
>
> Earl...
> Bothell, WA
>
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Earl Brunner on sun 28 sep 03
The place this scale might help the most is with the smaller amounts of
chemicals in even a 400-500 gram batch. It's awful hard to get one half
of one percent of cobalt carb or oxide accurately at that small of a
batch with a conventional Ohaus gram scale.
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of David
Beumee
Sent: Sunday, September 28, 2003 7:29 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Glaze testing at the micro scale
> Anybody done this? Any value to doing it?
> Any special research of interest that
> requires this kind of accuracy?
I do not see the value of making 1 gram glaze tests, even if you have
the
scale to do it accurately. I made 200 gram glaze tests for many years,
which
makes enough glaze to dip a test tile or "mouse", and the triple beam is
accurate enough to weigh out fractions of a percentage of colorant for a
200
gram batch. But I have taken to mixing 400 gram batches in the last few
years,
.
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