From Newsgroup: rec.puzzles
On Tue, 12 Aug 2025 20:45:45 +0100, Richard Heathfield
<
rjh@cpax.org.uk> wrote:
No 1s. Perhaps that's because 1 has fewer inked "pixels" to
offer. But why they don't just print solid black is anyone's guess.
Good guess and I figure that may very well be the answer given
that there are a lot of "heavy" digits -- 6s and 8s.
As for your question, it may just be a question of how much ink
they want to use. In my experience all such obscuring patterns in
"safety" envelopes are some kind of wavy lines, etc. and never
just uniform black. I also wonder if people do not like using an
envelope that is fully black inside.
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