I have used reject "pilt" glass fron a local glass factory.
It is broken pieces of clear glass vases, about 1 cm thick.
When I fill a flat open face relief mold with a layer of
this frit, the fired piece has thin opal lines thru as if there
were spider webb in the glass.
When casting in a deeper mold, the glass stays clear with
some bubbles in. Flower pot casting gives areaaly
clear piece.
I guess the ghost lines are micro bubbles that get trapped
between the shards. How to avoid them. As I understand it,
the more the glass is moving during the melt, the less
ghost lines there will be. In a flat relief mold the glass flows
only a little.
Is there a way to avoid ghost lines in a shallow cast?
-lauri
Ghost lines
Moderator: Brad Walker
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Have you tried taking the shallow casts up to a higher temp (1700F or so) to get the bubbles to rise to the surface? I guess if you're doing that, using the flower pot method would work just as well. Anyway, that's about the only thing I can think of.
Good luck and let us know if you find a solution!
Good luck and let us know if you find a solution!
Bob L Workshop - Take Two
June 10-11-12
Santa Fe NM
http://www.warmglass.com/phpBB/viewtopic.php?t=10420
June 10-11-12
Santa Fe NM
http://www.warmglass.com/phpBB/viewtopic.php?t=10420
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