Bill Edwards on thu 20 mar 03
Hi,
I am interested in seeing anyones pottery that may try
the chrome tin red I recently submitted. Please feel
free to manipulate the formulae at your discretion and
explain how you arrived at your changes. The only
reason I sent any information was to unite those who
have been fighting to achieve this color and see if
we, as a group could find better answers to a common
problem for unique color choices. Floating blues got
this go round as well as a few other colors in the
past. Lots of information was learned because we had
so many variations of testing and chemicals used in
the glazes as well as multiple people in different
areas firing differntly. I don't think anything
conclusive has been said about this fugitive color all
the years it has been around. Some get it on occasion
and some don't? Narrowing down the choices in what
makes it tick seem logical. I fire this one using a
computer controled schedual for ^6. Medium fire ramp
with a 15 minute hold, envirovent running and cool
down to under a 1000F normally and then I cut the vent
off. Why then? Vent warrantee says so. Heat may damage
the vent if cut off too soon! I have fired this color
using flip switches on other kilns but this is the one
I used for the tests.
^6 oxidation firings fail to let us achieve copper
reds and thus using cadmium may or may not be safe?
Depends on who you ask and how its fired. Also
chromium reds are not fire engine but can be bright
enough to appease many people once a glaze and clay
combination can be found.
I am working with lathinide colorants to some degree
but its always stimulating to find materials that are
new, stable and appealing. Reds have been among some
of the more sought after but fugitive colors out
there.
I remain completely open to your changes in
formulation and what you felt was needed to improve
upon the basic structure of the recipe. Please share
your finds with those interested in repeating whatever
it takes to arrive at the best solution for chrome tin
red. Once this has taken place some additional testing
can be done. Getting to the best red we can get,
followed by finding one the produces the least flaws
and followed up by FSIS/FDA testing. Sometimes we have
to settle that we can get the color but not the
acceptable levels we need from leachate testing. Its a
swap out. But also having this knowledge in front of
us is a guide on how to use the product and where to
apply it. I would like a nice bronze for some new work
coming up but I haven't had the chance to do any
testing. I am reproducing wood carvings for someone
and I feel this would enhance the finished product. I
can raku these but really prefer ^6 oxidation for this
project. I am sure that what I do find would be a
saturated glaze full of coloring oxides but then
again, this work is not used where any food would be
held. I looked in the archives but would like to hear
from someone who has used such a color and get some
imput from their own personal experience.
Happy Potting!
Bill Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
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