Readers, I haven't been posting lately. Everything is OK, I am just too busy these days to post.
David Grann has
a story in
The New Yorker about fine art authentication. If you read it make sure to read the whole thing—the tone changes about half-way through.
The article did not mention that it's easy to make replicas of human fingers from photographs using
the techniques of Japanese security expert Tsutomu Matsumoto. So if you have a photograph of an Old Master's fingerprint please don't put it on the Internet!