News for hackers. Stuff that matters.

A comment on Tetrachromats: people who see colors invisible to most of us (2014). Parent comment

Re:Tetrachromats: people who see colors invisible to most of... by agumonkey on Sunday November 17, 2019 @01:04PM (#21559067)
could have made a very nice spy communication channel
[ Parent | on HN ]
Re:Tetrachromats: people who see colors invisible to most of... by cerberusss on Monday November 18, 2019 @01:11AM (#21562284)
Something like "invisible ink"!
[ Parent | on HN ]