Taren Scott on fri 29 apr 05
Originally From: Nancy Tussey
Subject: Marbles fired into bisque
"Hello,
I'm an art teacher who wants to fire glass marbles into the bottom of =
pinch
pot type creatures. Firing at 1850- 1880 degrees F, is there any danger =
of
the glass melting a whole through the kiln? The clay I'm using is =
Lizella
red clay, bisque fired at cone 06-05."
Nancy,
I have fired marbles in plenty of kids' classes. Fired at bisque temps, =
the marbles deform but don't totally melt. We usually fired our pieces =
to Cone 6 for a smooth melt. (They do fine up to cone 10 also.) Care =
must be taken that marbles are only placed in recessed areas, with =
enough wall to form a pool into which the glass can melt, and absolutely =
no little spaces where the liquid glass can leak out, or overflow, =
because it will if given a chance. The kids always want to stick =
marbles in for eyes on vertical pieces, but you can imagine what a mess =
that would be!
The flattened glass gems sold at Hobby stores can be used the same way, =
and roll less into areas you don't want them to be. Most colors of =
marbles and gems fire true to their appearance, but occasionally you'll =
encounter glass that was translucent when you added it, opaque after you =
fire it. More common with reds than any other color.
I hope that helps....Good luck with the creatures!
Taren
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