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Tyvek Engraving: FAIL
Spurred by Jason’s comment on the laser test paper trials, I engraved some Tyvek:

Tyvek engraving You probably can’t see the “Test!” engraved below the blue logo, as it just changed the texture of the envelope without producing a visible mark.
The upper-right “Test!” ran at 10% (of 60 W) at 400 mm/s, with the others at 15% and 20%. The results suggest that it’s possible to remove ink and leave a visible mark, but it’s neither pretty nor dependable.
Somebody’s gotta have a weather-stable, super-flexy, dual-color, laserable material, but so far it’s hidden below my horizon.