[Ads-l] New to me: _wet signature_

[Wilson Gray]

"Wet signature" means that an actual signature in blue or black ink is
necessary. A photocopy will not suffice.

Of course, the term once had a literal meaning:

Illustrated Naval and Military Magazine: A Monthly Journal ... Page 70
https://books.google.com/books?id=pQ4AAAAAMAAJ
1885 - Read
The clerk returned with the letter signed, blotted the still-wet signature,
folded up and directed the reply, and silently handed it to its bearer, who
almost as silently wended his way to the quarters of his Chief in the Royal
Arsenal.
-- 
-Wilson
-----
All say, "How hard it is that we have to die!"---a strange complaint to
come from the mouths of people who have had to live.
-Mark Twain

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The American Dialect Society - http://www.americandialect.org