Welson on sat 14 feb 98
Hi everyone, the other day i visit some pottery shop and saw some =
interesting
bowl, a couple of them have a layer of glass on the inside bottom of the =
bowl.
I'm wondering how they do that? and i like to know is it possible to color =
the
glass to different color...
Thanks in advance, Welson
Gary Peden on sun 15 feb 98
In a message dated 98-02-14 12:08:56 EST, you write:
<<
I'm wondering how they do that? and i like to know is it possible to color
the
glass to different color... >>
Sometimes I put marbles in the bottom of my bowls....they melt and form a
colourful glass bottom to the bowl. Of Course this at cone 10 firing I'm
unsure at what temperature they would actually melt
Carrie Shields on sun 15 feb 98
Hi Welson,
Do you mean a layer of glass on top of the clay at the bottom of a ceramic
bowl? Or is it a ceramic bowl with a glass bottom?
If you're talking about glass on a clay bottom, it could be a very, very thick
layer of transparent glaze. The other possibility is melted glass...I've used
those flat glass floral marbles on pieces. Depending on the piece I've fired
them from 06 to 6, though I've heard of people using them on cone 10 pieces.
Floral marbles are available in a variety of colors; the colors I've used have
not faded at cone 6, but that may be because they are blues and greens. I
suppose it would also be possible to use the colored canes that glass blowers
use. I either crush the marbles with a hammer or leave them whole, depending
on the piece, then lay them onto the clay. I've only done this on areas where
the clay forms a floor and walls for the glass. The glass crazes as it cools,
and I'm not certain but suspect that it would pop off the piece if it was not
inlaid in the clay. I've only used this on sculptural pieces; I have no idea
if it is foodsafe or durable enough for functional ware. Due to the crazing,
I doubt it's safe.
Helllll on sun 15 feb 98
Hello there...
I have done this....
i took broken beer bottles etc... and broke them up ... then laid them in the
bottoms of pots...... i have heard that you should have some extra thickness
in your pot to give strength aginst the contraction of the glass... i never
worry to much..... but i have only done it a few time.....
note..... tried it at ... cone 04 and the glase did not melt all the way and it
did not look good.....
works good at cone 6 and cone 10.....
also... it would not be for food safe pots... you wouldn't want to eat little
slivers of glase..... because it will craze.........
creating, exploring, making, experiencing
Hank in OKC Oklahellma
Helllll@aol.com
Cheryl L Litman on sun 15 feb 98
I know someone who simply takes broken bottle glass and puts it inside
the bowl in with a regular ^6 glaze firing. Both wine and Snapple
bottles come in blue, amber and green colors. Another person I saw
recently at a craft show said she got scraps of glass from a hobby
stained glass shop and was happier since she then knew the melt
temperature of the various glasses she bought.
I've melted a few marbles into a bowl shape in a ^6 firing. Be careful,
they seem to bubble up higher than you would expect.
Cheryl Litman
Somerset, NJ
email: cheryllitman@juno.com
On Sat, 14 Feb 1998 11:39:35 EST Welson writes:
>----------------------------Original
>message----------------------------
>Hi everyone, the other day i visit some pottery shop and saw some =
>interesting
>bowl, a couple of them have a layer of glass on the inside bottom of
>the =
>bowl.
>
>I'm wondering how they do that? and i like to know is it possible to
>color =
>the
>glass to different color...
>
>Thanks in advance, Welson
>
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Alison Hamilton on sun 15 feb 98
I have used leftover scraps from stained glass artists on some of my
pottery pieces. The effect is pretty cool, although I believe it makes
the piece non-functional since the glass has all these cracks in it
which would develop its own bacterial community.
Alison Hamilton
Haliburton, ON
Welson wrote:
> ----------------------------Original
> message----------------------------
> Hi everyone, the other day i visit some pottery shop and saw some
> interesting
> bowl, a couple of them have a layer of glass on the inside bottom of
> the bowl.
>
> I'm wondering how they do that? and i like to know is it possible to
> color the
> glass to different color...
>
> Thanks in advance, Welson
C Redding on mon 16 feb 98
Welson--we have done that here at our school...all we do is take a glass
bottle, break it and lay the glass chips in the bottom of the pot...the
color of the glass used decided upon the color you will get at the end
result. We high fire stoneware/porcelain to cone 10, which is the temp to
which the glass melts for us....
cookie
On Sat, 14 Feb 1998, Welson wrote:
> ----------------------------Original message----------------------------
> Hi everyone, the other day i visit some pottery shop and saw some interesting
> bowl, a couple of them have a layer of glass on the inside bottom of the bowl.
>
> I'm wondering how they do that? and i like to know is it possible to color the
> glass to different color...
>
> Thanks in advance, Welson
>
Gary Peden on tue 17 feb 98
In a message dated 98-02-15 11:53:15 EST, you write:
<< I've only done this on areas where
the clay forms a floor and walls for the glass. >>
you can also shape a depression which the glass will fill like a heart or
shamrock...depending on the colour of the glass you can go wild. I don't
think you could eat of it either but maybe you can
Joan Fink on tue 17 feb 98
-------------------------------------
E-mail: sfink@netvision.net.il
Date: 15/02/98
Time: 22:39:21
This message was sent by Chameleon
-------------------------------------
When I fire with glass I usually put a coat of glaze on the bottom
followed
by a layer of frit, sprinkle crushed coloured glass in the pattern
desired,
cover with another layer of frit and fire to 1100. This can be done
in
several layers giving the effect of depth. I don't remember if it
crackles
or not - haven't done this for a while.
Good luck.
Joan.
Don Goodrich on tue 17 feb 98
It's worth noting that different colors and formulations of glass will
craze differently on fired clay. I've been using blue and green crushed
bottles for the candle-reflecting areas of stoneware sconces for several years
because the crackle effect sparkles so nicely with the flame. Recently I used
some red and orange marbles in the same way, and got very little crazing. On
closer examination (with good lighting and magnification), it appears that
although there are indeed cracks in the depths of the glass, they do not
extend all the way to the surface, which looks and feels smooth.
This being said, I'd still be reluctant to use this treatment on vessels
for food, because as we know, crazing can be delayed and that surface probably
won't stay smooth. Also, glass colorants may be toxic and may leach. I've
wondered if it would be possible to do the melted-glass treatment in a ^6
firing, then seal the cracks with a coat of low-fire (^06, say) clear glaze,
but haven't tried it.
As for the glass detaching itself from the clay, I've never seen it happen.
I use my own sconces; some have been through many cycles of heating and
cooling from candles or the dishwasher, and the glass has stayed put. It can
adhere so well to clay that in contracting it may break porcelain that it's
fired on.
Within its limitations (keep it flat when firing, avoid food-serving
surfaces) glass on clay has great decorative potential. Try a cloisonne
effect, separating color areas with paper-thin clay dividers, or let glass
colors flow where they will and be prepared for some stunning combinations
(and maybe some ugly ones). Can't find the right color bottle to crush for
your piece? Forage at a stained-glass shop. It's worth the experimentation.
Don Goodrich muddy indoors and out in Zion, Illinois
goodrichdn@aol.com
http://members.aol.com/goodrichdn
Timothy Dean Malm on wed 18 feb 98
Whenever I read messages that suggest placing crushed up glass in the
bottoms of pot prior to firing I remember that glass is unless properly
snnealed under extreme preassure and can shatter and shivver.If the object
it has been placed were to crack or break during the firing the glass is
likely to become liquid-like and flow all over your shelves, potentially
costing large amounts of time/money in grinding kiln-shelves and in the
loss of pots adjacent to the offending piece.
Tim Malm in Seattle
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