The piece in the middle distance shows the different colours of the two layers |
Keeping
the edge one colour on a two or multiple colour piece can be done by
cutting the upper layer larger than the lower one(s). If you are
making a 6mm thick piece, the upper piece needs to be 3mm larger all
around. So if you have a 300mm diameter base piece, the top will
need to be 306mm in diameter. This allows a coloured top to bend
over a clear base, giving the appearance of a single colour
throughout.
However
if you are building thicker than 6mm and are willing to allow the
glass to flow, you do not need to add the full thickness of the glass
to the size of the capping piece. I find that at 9mm thick, I need
only 4mm all around to cover the layers. This may be because the
outer edges are nearer 6mm than 9mm thick.
Of
course, if the final piece needs to be a pre-determined size the
lower layers can be cut 3mm smaller than the top all around (for 6mm thick pieces). The top is cut to the final size of the piece.
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