How You Can Turn Any Phone Into A Black Light

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Do toilets play a role in the transmission of influenza and gastrointestinal infections? Certainly. Is it hard to avoid a virus that forces you into the bathroom and makes you stick your head in the toilet bowl? Certainly not. There are microbes that should be removed from our toilets, but how do you know that the toilet in your home is free of germs? Here’s a quick trick to test your home for bacteria – and next time, if you can’t see the microscopic threats with the naked eye, use your phone!


DIY Blacklight by heftyco


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5 COMMENTS

  1. This will not work for the simple fact that You can’t generate U.V rays with a couple of sharpies. You will get the “blacklight” effect but You will not see any microbes.

  2. This about sums up my thoughts…

    RitchieW10 days ago

    Saw this on Facebook and doubted its validity, but I researched it anyways. First, in order for something to fluoresce, it needs to respond to UV light at the following wavelengths: Long-wave315-400nmLWUVA, Mid-wave
    280-315nm or Short-wave 100-280nm. The graph below shows the emissions of a White LED used in a smartphone. 400nm and shorter (to the left), there are NO emissions. Hence no UV. Second, all that plastic tape would absorb UV light if there were any. Lastly, the odds of creating a UV bandpass filter with sharpies and scotch tape, pretty much don’t exist. Not being mean, just stating the facts. The video “proof” was probably shot with a true UV lamp as the light source. LED_SPECTRUM.jpg
    http://www.instructables.com/id/Turn-Your-Phone-Into-A-Black-Light-Hack/

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