bill edwards on sun 10 jul 05
Jon Brinley your copy of those certifications and more
is on its way via email. It seems there were actually
more certifications found than what I had first
stated. Not my point but sometimes you have to find a
way to get attention, my pots aren't on the covers of
every magazine in the industry. I work when I want to
and often its for the HOB and consult for a local
government when not changing diapers or involved in
politics or reinventing the wheel. The intent was to
get those out there to at least read what others had
to say (Princeton perhaps) and not take my word on
anything at all! At least you read the statement, I
hope you read the Princeton information as well???
Ron - I looked for Woo yellow as I had that recipe on
disk at one time. It called for about the same ammount
of zircopax as what was listed for zinc. Is it
possible that the two got confused somewhere in the
mix? I can't see where zinc would play a role worthy
of noting in this mix for ^10 R. Zircopax maybe. I
would like to see the recipe that called for zinc if
it exists. I sent you the recipe anyways.
Dr.Ed - Thank you for the time you spent with me on
barium and the information you sent me. That was great
for future reference. I appreciate everything you do
and respect you observations and your imput. It's
vital!
Something NEW, DIFFERENT!!!!
When someone has the time and would like to examine
this particular glaze instead of using barium, please
let me know your results. It is within it's designed
limits for this type glaze so Ron, hold back for a wee
bit so we can get this one digested the way I wrote
it, if you re-calculate it now they are some bound to
confuse the two. The silica is on the low end of the
scale as was intended but in the range I intended it
for. AL203 is high of course. Since its a dry matte
the expansion isn't the point at this time. But I
would welcome a 3 day vinegar soak using various
colorants on this.
Dry Matte Code: 030101 ^6 ox. (Bill Edwards)
Ferro 3134 - 12.00
Dolomite - 16.00
Whiting - 8.00
Strontium Carbonate - 2.00
OM-4 Ball Clay - 20.00
EPK - 30.00
Silica - 12.00
---------------------
Totals 100
Pick your colorants wisely. I suggest staying in the
lower limits since leaching is going to happen at
higher concentrations due to the type glaze it is. I
will say this, it passed a vinegar test on certain
oxides at certain concentrations but I am not hoping
you will accept this as anything but a decorative
glaze that came from my need to reduce barium in a
glaze. Acidic solutions might pass but the dishwasher
and use would be another matter. Liner glazes have a
much better melt, slicker finish, often without or
with little metal coloring oxides usually with known
parameters for safety and who would want a glaze like
this for a plate or mug on the inside even without any
colorant oxides? Now you might could use it exotically
on the outside edge of a plate or mug if the surface
area wasn't more than 10% and the coloring oxides were
one such as those I tested for some years ago known
for safety. But lets not let the cat outta the bag.
You have to earn those numbers and teach me how you
got there first.
This is my first contribution (years maybe?) of a
glaze in a long time coming from me and possibly the
last. But there's lots of fun in examining someone
else's trials and errors, mine in particular.(Alisa
had fun with some of them some years ago) Inert
doesn't matter, there's free silica in this as in all
glazes. Use a mask and gloves when mixing. I doubt if
anyone will need to add anything to keep it from
seperating with the high total clay ammount. So don't
add anything. It will leach some if you over-dose the
coloring oxides as would most glazes but its your pick
and choose time for the experiment copper, cobalt, or
iron? See where it goes. MgO would be coming from the
ball clay. Hmmm, stuff justs hides in these things
everywhere. Silica is in every ingredient listed to
some extent less strontium that I know of. A small
ammount of barium is part of strontium with a small
ammount of sulphur. Once more, we see how micro
ammounts of other substances just appear like magic in
our glazes. But they are trace elements and this is
normal for these materials based on the refining and
company. There's little chance of some materials being
simplistic enough not to contain other materials
unless its man-made and refined out completely. Keep
in mind that strontium is good complimentary friends
to calcium and even barium. So if your glaze cannot be
made without the barium, you might reduce that
particular ingredient a little by subbing in some
strontium if you want to for your own recipes? B203,
the boron in this glaze comes from the frit used.
3.44% based on the numbers I use and the set
parameters I have for my own calculations software.
Remember, You have to imput your own information in
your calculations tools or rely on whatever someone
else has put in there for you. Now I am not teaching
anything here, I am wanting to learn something from
some of you out there. It's an experiment! We can
learn as we go. Vince I know you could be of great
help in this. Ron you will be of great help in this.
I would love to hear from anyone who uses this in
their experiments for a dry matte glaze and what
colorant oxides and ammounts you used. My email is
alive and well so send the results. Also please do
invite yourself to examine the results by applying a
lemon wedge or some vinegar to the piece so we can
define how well it held its oxides and at what ammount
before we see a breakdown. Lower the metal oxide
concentration, reduce the release, raise the metal
oxides and increase the release especially with
certain coloring oxides, try different ones. In time,
and if anyone does the experiment they will have their
chance to use this glaze and understand some of its
properties and begin working on ways to enhance their
creativity a little more safely for decorative use. I
will leave the food surface glazes and my calculations
in my safe for the time being since I paid for lab
testing for those results.
Bill Edwards
Edmar Studio and Gallery
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