Topic: Glass Mark

[chopin-liszt]

 
We have tricks. Signatures can often be very difficult to make out.

Sprinkling a little talcum powder over the mark, then wiping it gently with a fingertip will leave talc residue in the mark which can then be photographed.

You may need to fiddle a bit to get the light hitting it at the right angle.

[Lustrousstone]

Labels are sometimes retailer's labels and signatures sometimes belong to previous owners...