Mary Starosta on tue 25 may 10
Hi,I am researching Bristol Glazes (looking for specific information
cone5-7 Oxidation). I am looking for a book,source,articles,etc. I
have been playing around with a good BASE glaze that works well with
my cone 6 firing and brown clay stoneware body and am fascinated at
the moment with how colorants interact with Rutile in this zinc ox
based glaze. It has me spell bound at the moment and excited since I
haven't seen anything like it? It seems to blend well ( play well )
with other glazes over the top and down vertically. It's like a bit
satin "y' or matt like, but amazing over a matt glaze and it doesn't
seem to run off the pot if applied thinly. Still stays shinner than
,or glossy, with a matt glaze an layered. And the weridest thing, if
I keep the rutile consistent, and apply colorants, it's dramatic in
color with very little adjusting?
How can I mix up my base glaze (say 1000grams) divde that equally into
10 containers and than ad colorants to each test container? What
amount should I start with for colorants if the test has only 100grams
base glaze? I want to keep my Rutile at 6% per 100% base glaze and
than vary the other colorants. Thanks...not really good at math this
way Help would be appreciated.
--
Mary Starosta
Colorado Potter
http://marystarosta.wordpress.com/
Stephani Stephenson on tue 25 may 10
Mary
apologies for giving a brief and incomplete answer here.
but at least I can point to a possible solution!
Try doing the incremental colorant blends using=3D20
wet blends (mix your base glaze with water and divide the liquid
rather than the dry glaze.
Ian Currie describes an excellent method for doing just that.
even if you do not use his exact grid method=3D20
you will find his instructions on how to accurately measure
and dispense glazes incrementally quite helpful. i think his process save=
=3D
s time
and allows for greater consistency and accuracy when working with small
amounts of a test glaze.
you will need to invest in a graduated cylinder, some large calibrated
syringes and some plastic cups. his book(s) explain. all are available fr=
=3D
om
science supply places online or local ,or from vet supplies, etc.
This info might be elsewhere as well, but he explains it thoroughly .
i did a bit with a bristol glaze a few years back. want to revisit it.
happy testing!
Stephani S.
Paul Lewing on tue 25 may 10
On May 25, 2010, at 7:51 AM, Mary Starosta wrote:
How can I mix up my base glaze (say 1000grams) divde that equally into
10 containers and than ad colorants to each test container?
Easy. Use clear plastic cups. Mix your 1000g batch, with the 6%
rutile addition and divide it into 10 clear cups so that the level is
the same in all. An ear syringe or enema syringe will make this
easy. I find that an adult enema syringe sucks up very close to 100g
of wet glaze.
What
amount should I start with for colorants if the test has only 100grams
base glaze? I want to keep my Rutile at 6% per 100% base glaze and
than vary the other colorants. Thanks...not really good at math
You don't have to do any math to do this. Now that you have 100g
batches of glaze, one gram is one percent. I'd start with 1g, and add
more colorant in 2g increments, testing after each addition, up till
maybe 9g. An exception might be cobalt, which is very powerful. For
cobalt, I'd start with 0.5% and add 1g increments up to 4.5g.
Remember, there are three kinds of people in the world: those who can
do math, and those who can't.
Paul Lewing
www.paullewingtile.com
www.paullewingart.com
Steve Slatin on tue 25 may 10
One of the most important skills requisite
to being a potter is to be able to look
nonchalant while buying equipment.
Steve Slatin --
--- On Tue, 5/25/10, Paul Lewing wrote:
> I find that an adult enema syringe sucks up
> very close to 100g
> of wet glaze.
>
>
douglas fur on thu 27 may 10
Mary
This is slightly offtopic bbut I had some interesting ^5/6 tests out .
They are based on a formula in Cardew "well known in industry" for a ^5 zin=
c
glaze.
I used Zinc Zirconium Silicate to satisfy the zinc and opacifier
functions. (bristol glazes used tin) you might like to check out ZZS as a
"kills two birds with one stone marterial
DRB
Burien
Neon-Cat on thu 27 may 10
Mary, here's a glaze you might like for comparison. It's from a book
by John B. Kenny:
Bristol Glaze, cone 4-8
Zinc oxide - 7
Whiting - 10
Feldspar (potash or soda) - 68
China clay - 8
Flint - 7
Marian
Neon-Cat
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