will edwards on sun 15 oct 00
Recently I spoke of a glaze that I would not use but others have said why=
and
that they couldn't see a problem with the glaze. Also I got some that sai=
d
they agree with me. And lastly I got replies that told me their studio
conditions and materials are not the same as mine.
In order to clarify what I said in the beginning is how can we (As a grou=
p)
determine these findings of fact that I show in my tests for leaching and=
the
calculations I make.
Limit formula's do exist. However they are about as many ways to calculat=
e a
list of ingredients as they are colors in a rainbow+.
Final provisions are we take the materials to a lab and have an analysis =
done
for specifics. (Years of experience in that also concludes we get varying=
results from lab to lab).
So what do we do? The standards are so far apart based on what we enter i=
nto
the calculations that maybe we are getting confused here and there.
Is boron in unity with the rest (Mine was). I include B203 in unity but o=
thers
do not.
I look for similar traits among the finished product. I ask people from
various places if their findings can conclude what I see as a way to brin=
g
more varietal information my way in order to maximize the potential for
change. (See Boraq)tm. Its a good way to make findings of fact or destro=
y
those that do not concur with proper testing.
The importance of my questions was in regards to toxicity of the base rec=
ipe
and how well others who have calculation programs could help determine se=
t
limits prior to further testing via a lab and then basing these findings =
of
fact on the research that brought us the closest.
Would 4% copper carbonate or any other material hold well in a base or 43=
=2E5%
GB 43.5% PV Clay and 13%+/- Zirconium Silicates. Higher or lower?
I got more information than I could manage when I hit the globe with the
question. I got only 2 calculations however from others using their metho=
ds.
What I would love to do is offer up a lab tested version of this glaze on=
ce we
have made changes to it that would indicate its ability to hold in certai=
n
oxides. (I hear its very popular)
I do know that the above information entered into 50 different programs m=
ay
show 50 different results. However from those I could make better sense o=
n
which ones seemed to match the best and then perhaps find the link that p=
roves
why they are as close as they are.
Does anyone at all have a very simple, very clear base glaze they are wil=
ling
to share that has been good about holding coloring oxides in (tested by a=
lab
or not) other than the listed recipe? I will soon be offering a slew of t=
ests
to some labs for extractions of oxides and then shoot for high limits to
target some reasonable and sustainable numbers. Thus if I have a broad
spectrum of choices that are compiled by the many calculations programs
everyone is using I might hit on a few good bases that everyone could sha=
re in
(Always have them tested on your own levels and conditions) but you could=
use
the information to form a better glaze with programs like Insight(tm) and=
others. Who knows, your gram scale may be off? :)
The ones I used for my testing in the past was Duke University. However t=
hey
are only one group and in order to use their services you need to be a me=
mber
of the ACMI and a manufacturer. JEM Labs was another one. Also I used
additional services from Atlanta by private consultants,etc..
John H. Thankyou for the time and effort! It was an inspiration for me.
Also I am not about to go back into manufacturing again. I am wanting to =
do my
pottery but I want the very best information I can get for my glazes and
buying commercial isn't always the answer. Ron certainly has been able to=
make
things happen and they test out very well even if studio's and materials =
are
very much different. Lets move this into a safe and more elite field. I a=
m
tired of people telling me near my hometown why they will not buy pottery=
any
longer. (One large group is supplying poorly made wares and it is hurting=
the
reputation of us all here.) The only reason I hear for using the recipe i=
s it
is so easy to use and it works well with coloring oxides. So lets see if
another one will do the same without the GB in it but one that is much mo=
re
durable based on adequate technology and testing methods. A 3 part mix, c=
an it
be done? Or do we have the right one already?
Private e.mails are welcome. However I will make public the results when =
they
become available. I would love to know if Boraq (TM) would work for this?=
Wm Edwards
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