Steve Slatin on wed 29 oct 08
Mary --
You're not the only one ever to have done
this sort of thing, so the first thing to
do is to resolve to use it as a learning
experience.
With the 'right' recipe, you have more
sodium, more boron, less potassium, and
more calcium and magnesium (these are things
that lower the melting point of a glaze) and
less alumina and silica (which typically
raise the melting point). Bright sky blue
has a nice texture, and you probably got
a different surface as a result of the
substitution. Also, the magnesium and
sodium really effect color alot, and that
may be the cause of some distress on your
part.
If you go to the Ferro site, you'll find
this --
A lovely list of the contents of the various
Ferro frits. As you can see, Frit 3124 is
the problem -- but the one material that's
higher in what you need and lower in what you
want less of is Frit 3134.
If you add, say, 11% Frit 3134 into the mix,
you come fairly close to the original recipe.
In fact, if I were trying to 'cure' this
particular mixing problem, I might stop right
there and fire a test piece, just to see what
it's like. But I note that you mention color
issues, and I'd like to get the sodium and
magnesium closer to the original figures.
So I also tried adding 1.5% of talc to the
calculation. This gets the magnesium very
close, and while potassium is still a little
low, the boron is slightly high -- these
two materials are very different in their
function when a glaze cools, but both assist
in the melt. And magnesium can be a big
factor in color result.
The only material that's significantly out
of whack with this 'fix' is the alumina -- it
may still lack the 'hand' that the glaze you
want has. But it should be much closer.
Anyway, to find out if this is a valid fix
or not, and presuming virtually all of the
mixed batch is still there, mix the contents
of the bucket well, and separate a fraction
-- like one tenth -- by volume.
Then take one tenth (or whatever figure works
with the fraction you are using) of the dry
weight that would apply with the goal of
adding 11% frit 3134 and 1.5% talc, and
add those amounts to the fraction previously
separated. mix well, sieve, and mix again.
Now glaze a tester, and see what it's like
after firing. And, whether it works or
not, please let us know ... there's too much
to learn for any one person to be able to
do all the testing by themself.
Best wishes -- Steve S
--- On Wed, 10/29/08, Mary Starosta wrote:
> I screwed up and mixed up 7,000g of Bright Sky Blue from
> MC6G (Master Cone 6
> Glazes) Cone ^6 Ox. I used the Ferro Fritt 3124 instead of
> Fritt 3134 and
> now I have a throw away "pucky" blue glaze. Is
> there any way I can fix this
> glaze, it's really Awful with the wrong frit. Yikes. .
> . .
> Thanks in Advance for any help? I've tested over other
> glazes and so far
> nothing but ugly!
> Mary Starosta
> Colorado Potter
> http://marystarosta.wordpress.com/
Lynn Goodman Porcelain Pottery on wed 29 oct 08
Hi Mary,
What is the glaze supposed to look like, and what does it actually
look like?
Lynn
On Oct 29, 2008, at 9:30 AM, Mary Starosta wrote:
> I screwed up and mixed up 7,000g of Bright Sky Blue from MC6G
> (Master Cone 6
> Glazes) Cone ^6 Ox. I used the Ferro Fritt 3124 instead of Fritt
> 3134 and
> now I have a throw away "pucky" blue glaze. Is there any way I can
> fix this
> glaze, it's really Awful with the wrong frit. Yikes. . . .
>
Mary Starosta on wed 29 oct 08
I screwed up and mixed up 7,000g of Bright Sky Blue from MC6G (Master Cone 6
Glazes) Cone ^6 Ox. I used the Ferro Fritt 3124 instead of Fritt 3134 and
now I have a throw away "pucky" blue glaze. Is there any way I can fix this
glaze, it's really Awful with the wrong frit. Yikes. . . .
Thanks in Advance for any help? I've tested over other glazes and so far
nothing but ugly!
Mary Starosta
Colorado Potter
http://marystarosta.wordpress.com/
Randy McCall on wed 29 oct 08
Look at what you have and think about how maybe you could add more oxides to
it to change it, orrrrrr mix with another glaze. Sometimes you can mix two
glazes together and get something exciting. Just think about maybe what
would offset or enhance the colors you now have in the bucket. You may can
use it as an underglaze and layer another on top.
You can always add more oxides and get a black glaze possibly.
Randy
Cotton Patch Pottery
members.tripod.com/~McCallJ/index.html
----- Original Message -----
From: "Mary Starosta"
To:
Sent: Wednesday, October 29, 2008 9:30 AM
Subject: Help Glaze Bright Sky Blue MC6G Cone ^6 Ox
> I screwed up and mixed up 7,000g of Bright Sky Blue from MC6G (Master Cone
> 6
> Glazes) Cone ^6 Ox. I used the Ferro Fritt 3124 instead of Fritt 3134 and
> now I have a throw away "pucky" blue glaze. Is there any way I can fix
> this
> glaze, it's really Awful with the wrong frit. Yikes. . . .
> Thanks in Advance for any help? I've tested over other glazes and so far
> nothing but ugly!
> Mary Starosta
> Colorado Potter
> http://marystarosta.wordpress.com/
>
Mary Starosta on thu 30 oct 08
Lynn,
If you have the MC6g Book on page 100 it has a pic of "smash it before it
multiplies blue" It's that ugly.
And over glazes so far ugly. I haven;t tried it under glazes yet but mand I
was so disappointed!
Mary
On Wed, Oct 29, 2008 at 5:09 PM, Lynn Goodman Porcelain Pottery <
lgoodman@earthlink.net> wrote:
> Hi Mary,
>
> What is the glaze supposed to look like, and what does it actually
> look like?
>
> Lynn
>
>
>
>
> On Oct 29, 2008, at 9:30 AM, Mary Starosta wrote:
>
> I screwed up and mixed up 7,000g of Bright Sky Blue from MC6G
>> (Master Cone 6
>> Glazes) Cone ^6 Ox. I used the Ferro Fritt 3124 instead of Fritt
>> 3134 and
>> now I have a throw away "pucky" blue glaze. Is there any way I can
>> fix this
>> glaze, it's really Awful with the wrong frit. Yikes. . . .
>>
>>
--
Mary Starosta
www.StarostaTeam.com
ReMax Alliance
mary@starostateam.com
720-271-7523
Ron Roy on tue 4 nov 08
Hi Mary,
here is what to add to every 100 grams you weighed out of the original
glaze with the frit 3124. You will have to make some adjustments if you
have used much of the mistake.
Frit 3134 - 11.0
Wolastonite - 2.0
Talc - 2.5
Silica - 2.0
You are adding about 15% more material - you may have to add more iron,
cobalt and rutile but I don't think it will be necessary.
Let me know if you have questions - RR
>I screwed up and mixed up 7,000g of Bright Sky Blue from MC6G (Master Cone 6
>Glazes) Cone ^6 Ox. I used the Ferro Fritt 3124 instead of Fritt 3134 and
>now I have a throw away "pucky" blue glaze. Is there any way I can fix this
>glaze, it's really Awful with the wrong frit. Yikes. . . .
>Thanks in Advance for any help? I've tested over other glazes and so far
>nothing but ugly!
>Mary Starosta
>Colorado Potter
>http://marystarosta.wordpress.com/
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
| |
|
