Nancy Jervey on sat 22 apr 00
I am have problems with pink flashing on my tin white glaze. I am considering ch
problem of pink flashing and what can I expect my glaze to look like? Also will
similar fashion.
I understand the flashing is caused by Chrome in the kiln. I have localized my u
line is made using Mason Stain Black 6606 which lists it ingredients as CO,Cr, G
sometime when that thin black line is always used.
I am firing cone 7-8 oxidation in a electric kiln with controller.
I hope I am clear and I hope you can understand what I ask. I am in the middle o
pink flashing.
Thanks,
Nancy
Nancy Jervey on sun 23 apr 00
Could you please re-post this letter..The spacing was not right in the first pos
see the whole letter. Thanks
I am having problems with pink flashing on my tin white glaze. I am considering
changing my tin to Zircopax. I have two questions. Will this end the problem of
pink flashing and what can I expect my glaze to look like? Also will the glaze
underglazes that I use to decorate still respond in a similar fashion.
I understand the flashing is caused by Chrome in the kiln. I have localized my u
Chrome to a thin black line I use for decoration. That black line is made using
Stain Black 6606 which lists it ingredients as CO,Cr, Ge, Ni. But I cannot fig
pink flashing happens only sometime when that thin black line is always used.
I am firing cone 7-8 oxidation in a electric kiln with controller.
I hope I am clear and I hope you can understand what I ask. I am in the middle o
large order of small bowl (80). I have finished 40 with no pink flashing.
Thanks,
Nancy
Jean Cochran on mon 24 apr 00
Dear Nancy,
I changed from Zircopax to Tin Oxide because I want the pink flashing
and the warmth that Tin Oxide seems to me to provide. To me, Zircopax
is a dull and uninteresting substance while Tin Oxide makes a pot
dance. Anyway, in my experience you would lose the pink flashing.
Whatever, have fun.
Jean Wadsworth Cochran
Fox Hollow Pottery
(really in a hollow in Kentucky)
Cindy Strnad on mon 24 apr 00
Nancy,
Finish your order and fire the tin-glazed pieces alone. You should be fine.
Tin glazes produce a richer effect than zircopax, but are, of course,
considerably more expensive. You won't get flashing if you use zircopax, but
as to whether your oxides and stains react the same, well, that depends on
the oxides and stains. The only thing you can do is experiment and see what
works for you.
Cindy Strnad
earthenv@gwtc.net
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
Brad Sondahl on mon 24 apr 00
Changing to zircopax should eliminate the pink problem. I only get
pinks now in high rutile glazes (in fleeting spots). Most texts say to
double the amount of Zircopax to get similar whitening. I use up to 15
% to get a really white glaze. Zircopax doesn't melt in the mix, so
doesn't interact much with the glaze chemistry.
--
Brad Sondahl
New Homepage: http://pages.about.com/bsondahl/index.html
New commercial pottery page http://sondahl.safeshopper.com
Original literature, music, pottery, and art
Sharon31 on mon 24 apr 00
Hello Nancy!
I love Zircopax! I love it because of it's character.
But let's leave the love to the end. When you use Zircopax, you use a
different material than tin oxide, therefor you will not get the pinkish
appearance were you have chrome or copper.But three are two (or three)
points: First, you have to double the amount of the Zircopax according to
the amount of tin you used before -but still it will cost you
less.Second(this is about my love) The Zircopax has his own appearing if the
tin is soft and 'surrounds itself ' , give softness to the glaze, the
Zircopax kind of says: "Here I am". the appearance is harder and if you add
colorants, you might get molted glaze.
If you use a software, you can see that the Zircopax contains
67.21% ZrO2
and 31.76 % Si2O3
Ababi
sharon@shoval.org.il
http://www.israelceramics.org/main.asp?what=gallery.htm
http://www.milkywayceramics.com/cgallery/asharon.htm
----- Original Message -----
From: Nancy Jervey
To:
Sent: Monday, April 24, 2000 03:26
Subject: Changing from Tin oxide to Zircopax
> ----------------------------Original message----------------------------
> Could you please re-post this letter..The spacing was not right in the
first pos
> see the whole letter. Thanks
>
> I am having problems with pink flashing on my tin white glaze. I am
considering
> changing my tin to Zircopax. I have two questions. Will this end the
problem of
> pink flashing and what can I expect my glaze to look like? Also will the
glaze
> underglazes that I use to decorate still respond in a similar fashion.
>
> I understand the flashing is caused by Chrome in the kiln. I have
localized my u
> Chrome to a thin black line I use for decoration. That black line is made
using
> Stain Black 6606 which lists it ingredients as CO,Cr, Ge, Ni. But I
cannot fig
> pink flashing happens only sometime when that thin black line is always
used.
>
> I am firing cone 7-8 oxidation in a electric kiln with controller.
>
> I hope I am clear and I hope you can understand what I ask. I am in the
middle o
> large order of small bowl (80). I have finished 40 with no pink
flashing.
> Thanks,
> Nancy
Wade Blocker on tue 25 apr 00
----------
> From: Nancy Jervey
> To: CLAYART@LSV.UKY.EDU
> Subject: Changing from Tin oxide to Zircopax
> Date: Sunday, April 23, 2000 6:26 PM
>
> ----------------------------Original message----------------------------
> Could you please re-post this letter..The spacing was not right in the
first pos
> see the whole letter. Thanks
>
> I am having problems with pink flashing on my tin white glaze. I am
considering
> changing my tin to Zircopax. I have two questions. Will this end the
problem of
> pink flashing and what can I expect my glaze to look like? Also will
the glaze
> underglazes that I use to decorate still respond in a similar fashion.
>
> I understand the flashing is caused by Chrome in the kiln. I have
localized my u
Nancy,
Have you thought about getting a different black stain, one that does
not contain chrome? Mason's black stain 66l6 is chrome free it contains
only CoFeMn. That is the stain I always get. Mia in ABQ
> Chrome to a thin black line I use for decoration. That black line is made
using
> Stain Black 6606 which lists it ingredients as CO,Cr, Ge, Ni. But I
cannot fig
> pink flashing happens only sometime when that thin black line is always
used.
>
> I am firing cone 7-8 oxidation in a electric kiln with controller.
>
> I hope I am clear and I hope you can understand what I ask. I am in the
middle o
> large order of small bowl (80). I have finished 40 with no pink
flashing.
> Thanks,
> Nancy
Louis H.. Katz on tue 25 apr 00
My understanding is that Mason Color and Chemical sells a Chrome Free Black
that might be the answer to your problems.
Louis
Lorraine Pierce on tue 25 apr 00
Nancy, I heard from a friend that an acquaintance of hers who uses chrome in her
electric kiln 'cleans' it every fifth or sixth firing by firing it empty , to a
temperature, burning the oxide out of the bricks. It might be worth a try if the
is not too heavy a chrome impregnation of the bricks. I had no feed back from th
list when I posted questions concerning chrome contamination of tin glazes, and
not tried 'burning' the kiln out. Lets hope its more effective than the old wive
tale of putting potatoes in soup to soak up the excess salt! Lori inNew
Port Richey Fl.
Nancy Jervey wrote:
> ----------------------------Original message----------------------------
> I am have problems with pink flashing on my tin white glaze. I am considering
> problem of pink flashing and what can I expect my glaze to look like? Also wi
> similar fashion.
>
> I understand the flashing is caused by Chrome in the kiln. I have localized my
> line is made using Mason Stain Black 6606 which lists it ingredients as CO,Cr,
> sometime when that thin black line is always used.
>
> I am firing cone 7-8 oxidation in a electric kiln with controller.
>
> I hope I am clear and I hope you can understand what I ask. I am in the middle
> pink flashing.
> Thanks,
> Nancy
Linda Arbuckle on wed 26 apr 00
There have been several suggestions about using Cr-free black, which is
one idea that will work if you don't ever use any other stains
containing Cr, like teal colors.
If you drop the amount of tin below 5%, and add 1.5 times that amount of
zircopax, you can have the best of both worlds. A straight substitution
would be about 1.5 zircopax for 1 tin. Zirconium opacifiers produce a
less opaque white that is slightly less buttery. Some people like that
slight translucence. I've seen work with colored slips under a
zirconium-opacified majolica for the pastel color that shows through.
Stan Andersen, well-known majolica potter, uses all zirconium opacifier
in his majolica glaze. To counter slight translucence in the glaze, he
sometimes put white slip on large pieces to prevent any thick-thin spots
in the glaze from being a problem. I like my majolica very opaque...
toilet bowl white.... and hang on to some tin in the glaze to keep it
very opaque and a bit more buttery looking.
Linda
--
Linda Arbuckle
U.F. School of Art and Art History
Box 115801
Gainesville, FL 32611-5801
(352) 392-0201 x219
arbuck@ufl.edu
Smart on sun 30 apr 00
I tell you one of my stories :
One time I 've seen pink flashing on a white glaze,
All the pieces in the kiln was with the same glaze, without any chromium
stains. It was an electric kiln.
After several days with these defects we found the guilty element. The
resistances of the kiln was made with iron-chromium-Aluminium alloy and some
of them was damaged. After changing, we obtained good results.
Perhaps you have the same problem ?
Cordialement, Smart.
Don't forget to visit my French ceramic site :
http://perso.wanadoo.fr/smart2000/
----- Original Message -----
From: Nancy Jervey
To:
Sent: Sunday, April 23, 2000 3:24 AM
Subject: Changing from Tin oxide to Zircopax
> ----------------------------Original message----------------------------
> I am have problems with pink flashing on my tin white glaze. I am
considering ch
> problem of pink flashing and what can I expect my glaze to look like?
Also will
> similar fashion.
>
> I understand the flashing is caused by Chrome in the kiln. I have
localized my u
> line is made using Mason Stain Black 6606 which lists it ingredients as
CO,Cr, G
> sometime when that thin black line is always used.
>
> I am firing cone 7-8 oxidation in a electric kiln with controller.
>
> I hope I am clear and I hope you can understand what I ask. I am in the
middle o
> pink flashing.
> Thanks,
> Nancy
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