will edwards on fri 13 oct 00
While I missed the edition regarding the findings of John and Ron I have
watched these two over a period of time and I must agree that we do need =
to
limit much of the uses of toxins in utilitarian wares.
However we can also see what the limits are based on conclusive testing v=
ia
labs that work with standards as such that I worked with when I stayed wi=
thin
the A.S.T.M.labeling and safety act for products sold to the general publ=
ic.
What would be a grand adventure would be a set of base glazes that have m=
ade
it through the labs that hold their oxides that is published on a frequen=
t
basis.
John and Ron and (myself sometimes) can pick away at certain things but t=
hat
is how you define a product and re-design its use to one with a margin of=
safety.
If we had a base that can hold 4% copper in at the level used for water
testing on the avg. Then see if it would also do the same for reasonable =
%'s
of oxides to include Chrome and cobalt. Is 0.15% of chromic oxide in a gl=
aze
that contains Tin considered safe? Only if it were within a set of limits=
that
have been established, am I right?
Everyone can't own calculation programs and everyone can't be chemists an=
d be
potters at the same time. But, many people do rely on those out there who=
have
worked in the field or have simply been taught to analize materials and m=
ake
use of their information by placing it in a format for those in question.=
Toxicology can get very intense. Once more do we need a toxicologist to d=
ecide
or a lab that does water testing and has the equipment to expose potentia=
l
harm via leaching or other-wise.
The two are very different but they both play a role in modern research. =
I
placed an ad asking about a formula that is used very heavy by a public
facility that contains everything it doesn't need in abundance and less o=
f
anything else that it should have based on my experience. It didn't concl=
ude
my questions at first. It started me on a hunt for the right answers!
Since I am limited I use a calculation system and information I have glee=
med
over the years from paying 2 toxicologists and several labs to supply me =
with
good results but I was the inventor and the manufacturer of the products =
I
made. Then I pester people like John and Roy and others to see if I am i=
n the
grind here on occasion with my thinking.
Be alert first. Buy pottery that you are sure of that was made by potters=
with
technical know how or a test report of the glaze they use. Talk to the
manufacturers and if they will not disclose the needed information via pr=
ivacy
contract through you or by a lab don't buy things from them.
I recently had such a problem like that! (Bad experience) I heard everyth=
ing
but an answer. Of course the two attorneys that work in our studio was no=
t as
flippant about it as I was. I simply removed them from our log on the sys=
tem
and we won't buy there any longer.
Disclosure of a product is a legal binding issue unless you have the avai=
lable
MSDS work up and an analytical review of the ingredients done by a licens=
ed
lab stating in proportion this is what you submitted and it is confirmed =
by
such through tests. I won't go any more on this one because it is way too=
long.
Put only the best materials together that you can find that includes good=
reports from the source and then use this to supply your testing lab like=
(Alfred) a read out should you have one of each ingredient based on the l=
atest
finds. Add your own calculations if you can and ask them to sign a privac=
y
agreement and go for forth with the tests. Each suspect oxide should be t=
ested
and if you supply the ingredients and information you have many times the=
y can
use some of that or tell you how to fix a problem or that you information=
is
way off.
Sorry about this book but it is a needed tool for me and others who like =
to
explore the findings but also for those kids who drink from that cup and =
sit
the OJ around for a day and then decide its time to drink it. Heres anoth=
er
glaze to play around with. How much and how high would you go in percents=
based on this glaze? =
Ferro Frit 3134 50.00%
EPK 30.00%
Flint 20.00%
4% of any one of the below or 2% of two of the oxides below.
Cobalt Carbonate
Maganese Carbonate
Copper Carbonate
Green Nickle Oxide
Chromium (Chromic Ox)
Note the boron level should be up there a little bit since it is a boron
frit.
William Edwards
Opelika Arts Center
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