I.Lewis on sat 13 nov 99
------------------
I=92m surprised no one has yet said this but chemicals come in various =
grades,
from a variety of source and in a variety of pack sizes. These factors =
influence
the price you will pay and the purity of the product. Top of the range are =
those
used in laboratories which specialise in analysis. Super purity to better =
than
four nines, 99.99=25, purity is necessary. These come in small vials at
extortionate prices. Below this are various commercial and industrial =
grades.
Not all chemicals are available in all grades. By rule of thumb, rare, small
quantity, made special, high purity all add to the price.
Do you potter need impure materials in large quantities which do not have to=
be
synthesised or refined. Then why not try out the local horticultural =
dealers.
They mix the things you need in hydroponic fertilisers. Copper sulphate in
twenty five kilo bags. Cu, Mn, Zn, Fe, Ni, Co, most of these things are =
called
Trace Elements and can be purchased in four ounce packs. And be careful =
which
Bi-chromates. Apart from their carcinogenic tendencies, some are unstable =
and
can explode.
I use silver salts, and at a dollar a gram or more for nitrate I cut down on
expense by starting with fine silver and making my own salts.
By the way, one relatively cheap source of colouring pigments is readily
available from your art supplier. Artists Grade Water Colour Paints derived =
from
mineral sources can be used to great effect but may not burn out true. Look =
for
Cobalt, Manganese, Iron and Chrome pigments.
Adding colour to pale existence is an artistic objective.
Ivor in South Oz.
george koller on mon 15 nov 99
------------------
Ivor,
Thank you for your idea. If we should get to using these sulphates
in our work then I shall certainly check out our local.regional
Horticultural
dealers.
I was certainly not looking for laboratory grade (or prices) only a
convenient, and if possible single source for the materials. (Having 4
sources for 6 materials is a pain, and exensive for s=26h....).
Below are the prices from a single source I have only used for Chromium
Trichloride which I just ordered and have not received. If you search
the web you will find all kinds of chemicals but Chromium Trichloride
did
not show up until I found this outfit. Also finding the proper
quantities
is strange, couple of times I felt like a kid with 4 penneys to spend,
some of these people exepect to sell a drum as a minimum quantity, or
worse,
some of these folks are talking tanker loads.
Here are the prices, I asked for prices on =22lowest grade=22 available for
each..
Prices as of 11-11-99. From Antec (1-800-448-2954)
Pricing is as follows:
Cobalt Sulfate - =2458.00/500g
Copper Sulfate - =2418.15/500g
Potassium Dichromate - =2418.40/500g
Chromium Sulfate - =2489.00/500g
Ferric Sulfate - =2416.35/500g
Manganese Sulfate - =2418.85/500g
Nickel Sulfate - =2424.90/500g
Thanks again for the advice,
George Koller
Sturgeon Bay, WI - Door County
Where the tourists and our leaves have mostly left us. Hurrah for the
seasons=21
=22I.Lewis=22 wrote:
=3E ----------------------------Original message----------------------------
=3E ------------------
=3E I=92m surprised no one has yet said this but chemicals come in various =
grades,
=3E from a variety of source and in a variety of pack sizes. These factors
influence
=3E the price you will pay and the purity of the product. Top of the range =
are
those
=3E used in laboratories which specialise in analysis. Super purity to =
better than
=3E four nines, 99.99=25, purity is necessary. These come in small vials at
=3E extortionate prices. Below this are various commercial and industrial =
grades.
=3E Not all chemicals are available in all grades. By rule of thumb, rare, =
small
=3E quantity, made special, high purity all add to the price.
=3E
=3E Do you potter need impure materials in large quantities which do not =
have to
be
=3E synthesised or refined. Then why not try out the local horticultural =
dealers.
=3E They mix the things you need in hydroponic fertilisers. Copper sulphate =
in
=3E twenty five kilo bags. Cu, Mn, Zn, Fe, Ni, Co, most of these things are =
called
=3E Trace Elements and can be purchased in four ounce packs. And be careful =
which
=3E Bi-chromates. Apart from their carcinogenic tendencies, some are =
unstable and
=3E can explode.
=3E
=3E I use silver salts, and at a dollar a gram or more for nitrate I cut =
down on
=3E expense by starting with fine silver and making my own salts.
=3E
=3E By the way, one relatively cheap source of colouring pigments is readily
=3E available from your art supplier. Artists Grade Water Colour Paints =
derived
from
=3E mineral sources can be used to great effect but may not burn out true. =
Look
for
=3E Cobalt, Manganese, Iron and Chrome pigments.
=3E
=3E Adding colour to pale existence is an artistic objective.
=3E
=3E Ivor in South Oz.
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