this is before firing
this is after firing with clear glass 'edges' framing the central piece.
I added those afterwards and re-fired it.
I over-fired the piece, so the pattern has mishapen, and has a couple of holes,
but I'm quite happy with this.
I could also neaten up the corners to square the piece up more - but haven't as yet :o)
(I usually use COE 90 glass)