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Semen stains glows under black lights (uv light)?

  1. May 23, 2012 #1
    Hi all,

    Can anyone tell me if semen stains would definitely glow under a black light (UV light) ?

    I've been told that they would glow in greenish-yellow under the UV light.
    But later on someone said semen stains cannot glow without a substance called 'luminol'.
    Which one is true???

    And if the semen stains were stuck on a bed sheet like 5 months ago,(being slept on but never been washed), is it possible that the semen substances still remain on it? Would the scrubbing or fiction makes them totally coming off or disappear?

    Thanks in advance!
  2. jcsd
  3. May 24, 2012 #2
    Almost all "natural" fluids'colors (e.g yellowish color juices from mango, jack-fruits, Indian and Vietnamese curry etc) are hard to get rid off by only detergents sold in the market. Men's semen is the same. It sucks up and stains the materials'fibers, and then discolors the area. Once it is discolored, how can you get it back ? Therefore, it is advisable for you to wash the stained areas right after they are being "soaked".
  4. May 24, 2012 #3


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    Bed sheets being unwashed for 5 months, but being slept on? Yuck. Sheets should be washed regularly, like once a week.
  5. May 24, 2012 #4
    Yes, semen glows under UV light; No: luminol is used to discover blood stains; and Yes: wash your sheets much more often!
  6. May 25, 2012 #5

    Andy Resnick

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    Usually it does, but the signal can be masked by other compounds (and the fluorescent proteins degrade over time):


    Note also the difference between "presumptive" and 'confirmatory'.
  7. May 25, 2012 #6
    Would semen stains appear as transparent (like an oil stain) under friction after a long period of time, say 5 months?
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