Ghost lines
Posted: Tue May 27, 2003 2:25 am
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
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