They didn't reply, but seem to have quietly dropped the idea, or at least don't openly advertise it. They were proudly advertising the ability to remove unsightly deposits such as wax, so I wrote a letter, which GC then put it into more delicate terms. Richard (I think?) brought it to my attention on this forum.
I've just acquired this (seller's pics) - I believe it to be S. 2764 1a2.
It has wax on the reverse, presumably for cataloguing purposes back in the day - can anyone identify it as an example that may have appeared in a book/catalogue?
Bit of a long shot perhaps, but thanks in advance!
Nicer place than the northwest , I am having similar probs here been in six months, at least the northwest is famous for its rain esp cumbria.
Thank god I managed to get our new shed up in the only month there was little rain august
You don't remove wax. It is one of the main pieces of evidence of previous illustration, even if you don't know where it came from. I wrote an email emphasising this point to PCGS a few years ago when they were promoting their conservation destruction of historical evidence service.
I'm not aware of any auction room that used green wax. Sotheby and Glendining both used red , but depending on when and who, came in varying shades from bright scarlet to a dark red with a distinct purple hue.