On 19/06/2020 10:15, Tricky Dicky wrote:
I once saw a professional cut a mirror at a local glaziers and he just scored one side. Unlike window glass I think mirrors have to have the edges ground/polished before being handed to the customer which would probably take out any fraying of the silvered layer.

Richard

The traditional way of cutting glass is, of course, scoring and
snapping. But I have often cleaned up and made safe "chipped" edges on
glasses, etc. with abrasive. I have sometimes wondered whether it would
be possible to cut glass sheet with something like a tile cutter,
perhaps using a diamond wheel. Or, say to take off a corner, with a
diamond disk in a Dremel.