Copying Pencils, Indelible Pencils, and the Excluded Middle

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.)

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3 Responses to Copying Pencils, Indelible Pencils, and the Excluded Middle

  1. 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?

    Like

  2. Thanks, Sean. I think I was too befuddled to realize that I could probably find an answer by searching.

    Like

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