Janine A. Lee on tue 24 mar 98
Hello All,
A student in my class got confused and accidently used acrylic paint to add
color to his terra cotta pot instead of underglaze! I had the acrylics out
for a project for another class and he went onto to the underglaze step
without checking in with me. BIG MISTAKE! YIKES!
So, since I'm new to the workd of ceramics. I come to you for advice. Can
his pot still be fired? I intend to fire the others to cone 04.
Thanks for your help,
Janine A. Lee
ride2995@ride.ri.net
Creative Arts Director
Community Preparatory School
126 Somerset Street
Providence, Rhode Island 02907
R12396 on wed 25 mar 98
Janine,
I too occasionally get things mixed up, and sometimes fire projects that have
acrylic paint on them. What will happen is that the paint will burn off
leaving a white powdery residue on the clay . I usually scrub the residue with
water and brush. After it's dry go head and glaze, With a dark color,
hopfully, it will cover it , but then again it could crawl. Also, keep in
mind. vapors given out when burning off the acrylic, vent well.
Later, R12396. "The Clay Stalker"
Will Mosher on wed 25 mar 98
On Tue, 24 Mar 1998 07:48:15 EST "Janine A. Lee"
writes:
>----------------------------Original message----------------------------
>Hello All,
>
>A student in my class got confused and accidently used acrylic paint
>to add color to his terra cotta pot instead of underglaze! I had the
>acrylics out for a project for another class and he went onto to the
>underglaze step without checking in with me. BIG MISTAKE! YIKES!
(they tend to do that, don't they?)
>
>So, since I'm new to the workd of ceramics. I come to you for advice.
>Can his pot still be fired? I intend to fire the others to cone 04.
Probabably yes. I had a friend who did much the same thing, but knowing
that paint is not = to underglaze. She tried Liquitex Ivory Black, and
when fired, it gave the pot an uneven reddish color. This, of course, was
of great interest to the entire class, and my mentor, since _good_ red
glazes or stains are hard to come by. (We had some, but when you fire odd
loads with many different kinds of glazes, it's hard to achive the same
chemical enviroment in the kiln twice for the touchier glazes.)
I would speculate that the polymers in the paint would break down fairly
harmlessly, though I would (of course) not want to breathe the air of the
kiln room while it was firing.
--Will Mosher
workscited@juno.com
Underemployed Educator, Western MA
p.s. do you know of any good art-education, or education lists out there?
>Thanks for your help,
>
>Janine A. Lee
>ride2995@ride.ri.net
>Creative Arts Director
>Community Preparatory School
>126 Somerset Street
>Providence, Rhode Island 02907
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ceramics@epix.net on wed 25 mar 98
In article ,
"Janine A. Lee" wrote:
>Janine, the acrylics will burn off in the firing (it will add a new aroma to
your firing). I assume the decoration is only to the outside of the pot. If
they used dark colors some residual color may be left behind, but wise color
choices can reduce the effect. Your student can underglaze decorate the
bisque. When ug is comletely dry use a well loaded glaze brush (don't want
drag to smear the colors or pull it off) to apply glaze as usual. The colors
of the finished piece will not be as strong as they would have been done on
greenware.
Old Mud Hen
Andy
> ----------------------------Original message----------------------------
> Hello All,
>
> A student in my class got confused and accidently used acrylic paint to add
> color to his terra cotta pot instead of underglaze! I had the acrylics out
> for a project for another class and he went onto to the underglaze step
> without checking in with me. BIG MISTAKE! YIKES!
>
> So, since I'm new to the workd of ceramics. I come to you for advice. Can
> his pot still be fired? I intend to fire the others to cone 04.
>
> Thanks for your help,
>
> Janine A. Lee
> ride2995@ride.ri.net
> Creative Arts Director
> Community Preparatory School
> 126 Somerset Street
> Providence, Rhode Island 02907
>
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Cindy on wed 25 mar 98
Janine,
Most of the paint will burn away if you fire it. Depending on the quality
of the paint (does it contain "real" pigments made from metals?), some of
the color may survive. From your post, I get the impression this is a
bisque-fired piece. If so, another firing should proceed fairly smoothly.
If it is greenware, and if the piece is covered completely, or mostly, with
paint, you will need to fire very slowly to allow water to escape safely
without destroying the piece.
Cindy Strnad
Earthen Vessels
Custer, SD
USA http://blackhills-info.com/a/cindys/menu.htm
Gracedart on wed 25 mar 98
hi jenine
i had to laugh not at you & student but with you...how many times has this
happened to me...or finding out a student was painting on wood with $$$glaze
!...Time to package differently...and someone still won't read the label...
Amazingly enough some of the acrylic survives a cone 06 firing ! I fire the
mistake just to burn off the plastic and most of the time it does..can't
remember what we've done with the pieces that have residual acrylic on them...
Grace
Jeff Lawrence on wed 25 mar 98
Janine Lee was asking about firing paint:
>A student in my class got confused and accidently used acrylic paint to add
>color to his terra cotta pot instead of underglaze! I had the acrylics out
>for a project for another class and he went onto to the underglaze step
>without checking in with me. BIG MISTAKE! YIKES!
>
>So, since I'm new to the workd of ceramics. I come to you for advice. Can
>his pot still be fired? I intend to fire the others to cone 04.
>
Hello Janine,
I've fired my ballclay/talc cast wares to ^04 in oxidation after they were
painted a rather tepid gray that I dislike.
I thought to myself: acrylic is plastic, so it should all burn off to leave
a clean piece.
Instead, the gray burned to a mustard yellow, sintered-on but porous
coating. No flashing effects were observed on even closely neighboring pieces.
I'd bet 50 cents cash money you could fire it once to burn the paint on/off
and then glaze-fire it with possibly interesting (unpredictable) results.
Have fun!
Jeff
Jeff Lawrence
jml@sundagger.com
Sun Dagger Design
Rt 3 Box 220
Espanola, NM 87532
ph 505-753-5913
JLHclay on fri 27 mar 98
Rebisque the piece to burn off the paint. You might have some reaction from
the oxides in the paint. You do have a sense of adventure don't you? Have
any advise to an artist working with middle school students, advise on
techniques for dealing with the one or two who don't pay attention the first 3
times I say something. jlhclay in Tucson
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