Tom Buck on thu 15 mar 01
Veena
My comments about glzcalc was not to deny you doing glaze tests,
but rather to give you ample warning that textbook recipes may not suit
your claybody and firing practices. So, without finding the Seger Formula
you may not know how to make the second step after the first glaze test
bombs. A few years ago, a local potter decided he would do tests of some
glaze recipes for copper red at C10 R. He tried hard bit didn't realize
the needed components for a successful copper red. After 100 tests nicely
mounted on a board for all to see, he still didn't have a useable copper
red. Don't let this happen to you.
bye. peace. tom b.
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
Tom Buck on fri 16 mar 01
Hi Veena:
Point made and taken. Everybody always should cite both Batch
Recipe and Seger Formula (aka unity F.), the first so the proportions of
their raw materials are provided, and the second, the Seger, so that the
fired result is known in molar terms. The molar values will thus
accomodate potters far afield who have different materials and different
claybodies. Through the Seger F. distant potters can arrive at a first
approximation of the glaze, and from that, use appropriate tests to
fine-tune the recipe.
til later. Peace. Tom.
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
Veena Raghavan on fri 16 mar 01
Hi Tom and anyone else on Clayart, who might have might have read my post.
I did not express myself at all well, Tom, as I did not mean that
you were in anyway suggesting that folks like myself, who do not know how
to calculate glazes should be denied the opportunity of testing glazes. On
the contrary, I meant to thank you for what you said in your earlier post,
as there are many of us, who do not have this skill and, if only formulae
were to be given and not recipes, as someone suggested, we would be totally
lost. I meant to show my appreciation of your post and to agree with you
that it is a skill every potter should learn.
It just goes to show that one can really say the wrong thing
sometimes, and I apologize for any misunderstanding. Tom, you have always
been such a support and help to those of us who do not understand glaze
chemistry, that I would never dream that you would want to deny us
anything!
As always, your advice is sound, and will be taken to heart,
although it will take some time.
All the very best, as always.
Veena
My comments about glzcalc was not to deny you doing glaze tests,
but rather to give you ample warning that textbook recipes may not suit
your claybody and firing practices. So, without finding the Seger Formula
you may not know how to make the second step after the first glaze test
bombs. A few years ago, a local potter decided he would do tests of some
glaze recipes for copper red at C10 R. He tried hard bit didn't realize
the needed components for a successful copper red. After 100 tests nicely
mounted on a board for all to see, he still didn't have a useable copper
red. Don't let this happen to you.
Veena Raghavan
75124.2520@compuserve.com
will edwards on fri 16 mar 01
TB said>>>." After 100 tests nicely
mounted on a board for all to see, he still didn't have a useable copper
red. Don't let this happen to you."
Veena and anyone else. The above is true for the most part. But somewhere=
along the line to finding that exact glaze you might discover another one=
that
kicks its heels up even more so. Calculations programs do one thing very =
well,
and thats give us an accessment of the units of minerals and elements tha=
t
make up the formula by seger/molecular%/Weight%/and another dozen of more=
methods people have written.
We see the limits high and low and we know all the analyticals for each
material but we still don't have one that can produce pictures from the g=
laze
you enter. (I would give my left expletive for one that could do that) Wr=
ite
in a formulae and get a picture. WOWZY! However we lazy folks will need t=
o
continue doing tests like firing as Alisa does till that happens. That la=
dy is
a worker!!!!
However as Tom stated if you are after a Copper Red based on anothers exa=
ct
formulae or method, then you will have to re-produce it exactly like the
original or have some way to make up for the variances in your amterials.=
Then
you will either be an Alchemist like me or you will need some magical too=
l to
help you. :)
William Edwards
Alchemy 101 - It says 101, that means a hundred and one ways to describe =
the
same process.
=
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