xavier & lucy becquer on wed 30 dec 98
I am searching for a 100=25reliable bright yellow matt glaze to be used in =
cone 10
gas reduction over miller 900 clay(buff stoneware). I do not want to use =
any
glaze that has barium or lead, as this is for a dinner ware set. The best I =
have
come up with is the following
Caramel Yellow
PETALITE 46
Nepheline syenite 36
Titanium dioxide 12
Dolomite 9
EPK 9
but it is to pale. here are my questions?
1. Where does this glaze get its color from? none of the ingredients seem to=
be
colorants.
2. What can I increase to make the glaze a brighter yellow? can this be =
done?
3. Can I add something else to make it more yellow? R.I.O.
4. Do you have a better glaze to start off with?
help=21=21=21=21
Xavier
Chris Schafale on wed 30 dec 98
Hi Xavier,
I'm not a guru, but here's my shot at some of your questions:
1. I believe the yellow is coming from the titanium, but I don't
think putting more in would ever make it a bright yellow.
2 & 3. How about using a fritted stain? If you want a bright
yellow, I think this is probably your best bet. Mason Color Works
has a number of yellows, which are made with vanadium or
praseodymium. I understand vanadium is quite toxic, so don't use it
in its raw state, and I don't know what to tell you about using it in
a fritted stain form. Last I heard praseodymium was not known to be
a baddie. Mason has a nice color chart that shows all the available
colors and tells you what's in them. You can get the color chart
from many ceramics suppliers who also carry the stains, or probably
also from Mason (Phone: 330-385-4400).
4. Can't help you here, as I do only cone 6 oxidation.
Good luck!
Chris
> ----------------------------Original message----------------------------
> I am searching for a 100%reliable bright yellow matt glaze to be used in cone
> gas reduction over miller 900 clay(buff stoneware). I do not want to use any
> glaze that has barium or lead, as this is for a dinner ware set. The best I ha
> come up with is the following
>
> Caramel Yellow
>
> PETALITE 46
> Nepheline syenite 36
> Titanium dioxide 12
> Dolomite 9
> EPK 9
>
> but it is to pale. here are my questions?
>
> 1. Where does this glaze get its color from? none of the ingredients seem to b
> colorants.
>
> 2. What can I increase to make the glaze a brighter yellow? can this be done?
>
> 3. Can I add something else to make it more yellow? R.I.O.
>
> 4. Do you have a better glaze to start off with?
>
> help!!!!
>
> Xavier
>
>
Light One Candle Pottery
Fuquay-Varina, NC
candle@nuteknet.com
Earl Brunner on thu 31 dec 98
The yellow you are getting is probably coming from the titanium with a little ir
interaction from your clay in reduction
I don't know how much you want to spend on this yellow glaze, but there is a
relatively new ceramic stain on the market. You did not say where you were. If
are in the US you could contact Trinity Ceramics in Dallas/Fort Worth, TX
(214-631-0540). They are the US supplier I believe for Cerdic stains. I might
get this exactly right, but I understand that they are inclusion stains, the co
is imbedded in a highly refractory (zirconium?) matrix and the cone ten firing r
doesn't affect the color. I have heard that they manufacture it in two grades a
one is supposed to work better at cone ten, but you can get a very bright yellow
orange with these stains, the red isn't quite as bright. They are not the cheap
things on the market. I understand that they are also available under the
manufacturer name of Degussa, a German company.
Earl Brunner
xavier & lucy becquer wrote:
> ----------------------------Original message----------------------------
> I am searching for a 100%reliable bright yellow matt glaze to be used in cone
> gas reduction over miller 900 clay(buff stoneware). I do not want to use any
> glaze that has barium or lead, as this is for a dinner ware set. The best I ha
> come up with is the following
>
> Caramel Yellow
>
> PETALITE 46
> Nepheline syenite 36
> Titanium dioxide 12
> Dolomite 9
> EPK 9
>
> but it is to pale. here are my questions?
>
> 1. Where does this glaze get its color from? none of the ingredients seem to b
> colorants.
>
> 2. What can I increase to make the glaze a brighter yellow? can this be done?
>
> 3. Can I add something else to make it more yellow? R.I.O.
>
> 4. Do you have a better glaze to start off with?
>
> help!!!!
>
> Xavier
gwalker on fri 1 jan 99
Hello Xavier,
You are correct in assuming the yellow is from the titanium. Applying
the glaze a little on the thinner side will also help, but what makes a
high titanium glaze VERY yellow is the presence of a fair bit of chrome
in the kiln and a high calcium content in your tit. glaze.
It may be a bit to caramelly for you, and maybe a bit too much on the
glossy side, but if you take a look at our carnival range on my web site
and like that yellow, I will send you the recipe. It is fired to cone 10
in reduction. I emphasise, though, that without chrome in other glazes
in the kiln, it is a rather pathetic cream.
Best of luck, and a Happy New Year.
Geoff Walker.
http://www.cronulla-pot.com.au/
Paul Lewing on fri 1 jan 99
Hi, Xavier,
The yellow is coming from the titanium, and adding more won't make it
brighter yellow. It's already got really a lot of titanium. Your
only choices for a truly bright yellow at cone ten are a cadmium
inclusion stain, in either ox. or red., or a tin-vanadium stain in ox.
As to the glaze you've got there, it sounds like a spectacularly bad
choice for a dinnerware glaze, for several reasons. And why do you
want to make a dinnerware set with a matt glaze in the first place?
Have you tried rubbing cutlery on this glaze? I used to use one
similar to it, and I couldn't even touch the pots with dirty hands
without staining it so bad they had to be refired to get rid of the
marks.
Good luck,
Paul Lewing, Seattle
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