It is possibly an epoxy resin, it may soften with a paint stripper but it require extreme care so as not to damage the mirror.
Epoxy will fail with heat as a last resort, you could try a soldering iron to see but stay off the glass. If that has the desired effect, ensure that you heat the whole thing evenly over a reasonable period with a slow ramp up & down. Maybe a commercial oven.
Best of luck
Barry
Last edited by Baza; 06-11-2014 at 06:04 PM.
Reason: spelling
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