Bill Edwards on sun 20 apr 03
Just ignore or delete the posts that have things you
don't want to read once you see they are looking for
lip service or rhetoric. They are many political
people who dive in only for that and others who find
things to stir the dust up having nothing at all to do
with art or pottery for that matter. You know the
kind!
Clayart is genderless and without color (except for
glazes) or proclamation to country, state or
government.
Art is universal in appeal and in quality and each has
its own historical and priceless differences. Politics
change with the weather just like the fickle minds of
those who carry it as if it was their burden to do so.
CRT Base
Edwards ^6 Ox. (Red November)(Maybe Aprils Turquoise)
Neph. Syen - 25.00
Wollastonite - 25.00
Frit 3134 - 15.00
EPK - 15.00
Silica - 20.00
Alkyline, Calcium, with as low AL203 as I felt
appropiate and low boron. This base might even be a
good one for turquoise? Try it with 5.00 Tix Oxide and
2-3% Copper Carbonate and see? Yes - it needs lab
testing for food surface as does all glazes containing
any toxic item or colorant known to be hazardous in
any form or fashion. Copper is one of those in
particular if you have Wilsons disease. Chrome is used
in micro amounts based on the glaze and is negligible
in my own opinion but see above. TEST! Chrome Tin Red
-5.00% Tin Oxide and .020 to 0.30 Chromium Oxide
Green. Some suggest a lessor amount. Time for you to
do a grid or make several small batches. I use 0.30%
and then dip a test tile and then try and use the
glaze up once it sets after a week to 10 days. 4 Weeks
in the bucket at 0.30 and you will start seeing a
shift towards liver maroon. Can you get this stable? -
You can get to a point where its much easier to deal
with. Use your mason stains which are suited to glaze
bases like this where solubles inter-act with the
coloring oxides. Is it perfect or a real fix? No, but
it will help to a high degree and with some stains it
does fix the issue in many cases if the stain its self
proves to fire at true color the first round. Ron
pointed out something that I would like to expand on.
We are talking about alkline material here. Neph Syen
(More soluble) can be replaced with Feldspars such as
NC-4 or others that can have a less solublity problem.
The expansion will be different and needs calculation.
Even Potassium like G-200 is an alkyline contributing
product and *lithium. (Doing this from my sleepy
head). The brightest red that I have obtained over
hundreds of ragged tests were from bases like or
similar to the one posted that I wrote to cover this
issue for my own needs. I do have pictures and have
offered them over and over and had a couple takers.
(little interest until I am through with it and then
it revives itself as if by magic months down the road)
I am tired of this color and the tests and even though
I have many other CTR's the one above is the one that
beat all the ones I tested be it mine or someone else
as far as color goes. Its picky, its not really
practical unless you can use it up within a month of
so and there certainly is some loss of ignition and
color placement onto tin containing wares given some
firing conditions of kilns/glazes in them. Lets work
on turquoise and re-vamp the base if we have to. I am
so ready for a change in tests and exercise. I have
about 4 turquoise bases going on now and never even
considered the above base for it and it shows that it
could very well support this color in everyway. All we
need to do is change the name to Edwards Turquoise
that rose from the ashes of Novembers Red. Too long
huh? I like to keep track of my bases out there so I
can use that information, I think thats fair given the
time applied to the work and sharing of it. You be the
judge! Its team work and less political that way. For
those who made it this far - Its a ^6 oxidation base.
* denotes - Toxic or I don't use it
Neph Syenite - Sodium and soluble. Rock sourced, still
good for many uses in my opinion.
See feldspars for replacement.
Have lots of fun!!!!
Bill Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
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