Sometime around 1923, the Eberhard Faber Company wanted everyone to know the difference between indelible pencils and copying pencils. To that end, they offered this explanation to the stationery trade:
Perhaps I’ve misinterpreted the description, but I’m left with the impression that a pencil is either a copying pencil or an indelible pencil. However, from the Eberhard Faber catalog printed that same year:
(I’ve heard that, on principle, Heisenberg was certain this was Schrödinger’s favorite pencil.)
I’m trying to understand how one might apply moisture to a pencil to make mimeographed copies. Is it a matter of wetting a page written with a copying pencil?
As far as I understand, yes. Here is an excellent description: http://cool.conservation-us.org/coolaic/sg/bpg/annual/v17/bp17-05.html
LikeLiked by 1 person
Thanks, Sean. I think I was too befuddled to realize that I could probably find an answer by searching.