> On the subject of doing clever things with glass - does anyone know
> how they make those ornaments which have '3d engravings' inside a
> block of glass?=20

Laser focused by a machine in the block. Electron beam radiation has the
same effect on some plastics. You can obtain the same effect using
infrared focused as above (f.ex. from a large halogen lamp) but that will
be very slow unless the plastic is doped with something that abosrbs IR
well.

Peter

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