In
general slumping will not remove the evidence of etching. There will
be very little effect on etching on the bottom even at fire polishing
temperatures.
When
the etching is on the top side exposed to the radiant heat of the
elements, you need to be careful to use the lowest practical
temperature for slumping. It is possible to achieve a satin finish
to a sandblasted surface at 677ÂșC with a soak of two hours. It
depends on the delicacy of the etching texture as to whether the
slumping will affect it much.
The
more the glass will need to move during slumping the more distortion
will be apparent in the finished piece. This can be minimised by
using a low heat for considerable time.
If the
mould is very detailed, it would indicate that etching should be done
before the slumping due to difficulty in attaching the resist to the
shaped glass, unless you paint it on. But again, a significantly
long soak will be required to achieve the detail of the mould.
If it
is a simple and relatively shallow slump it may be easy to etch after
shaping. It is a question of how easy it is to get the resist to
conform to the curve.
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