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  • 5
    just use opaque (because it is the right word) but back it up somewhere else in the literature with 100% light-blocking or something similar.
    – Jim
    Commented Jan 29, 2015 at 18:43
  • 6
    Observant, @HotLicks, but I prefer totally opaque :-) or better yet absolutely opaque. The physics exchange may have a technical term.
    – ScotM
    Commented Jan 29, 2015 at 23:11
  • 5
    How about "attenuates transmission of electromagnetic radiation in the visible light range by a factor of 100 dB or greater".
    – Hot Licks
    Commented Jan 29, 2015 at 23:30
  • 1
    I blame programs like Photoshop using words like "opacity" instead of "translucence".
    – user39425
    Commented Jan 30, 2015 at 6:48
  • 1
    @fredsbend But then you would have to invert the scale so that "100% translucent" would mean fully transparent. This may go against people's intuition.
    – nitro2k01
    Commented Jan 30, 2015 at 12:13