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Lexan drops - Which side is UV?

Discussion in 'Newbie Forum' started by mattready, May 30, 2012.

  1. mattready

    mattready New Member

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    Oct 19, 2010
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    So we have a ton of drop left over from panels we have cut. Problem is they were not properly marked when they were cut and now they have nothing to distinguish the UV side. :doh: Anyone have a tip/trick to figure this out? Thanks in advance!

    matt@signshopltd.com
     
  2. ChicagoGraphics

    ChicagoGraphics Major Contributor

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    sure

    welcome to signs 101
     
  3. BIG EASY DOES IT

    BIG EASY DOES IT Very Active Member

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    Polaroids show up only when light is transfered onto them correct. Black cloth stops light but not UV light. Put an unexposed poloroid under the plexi with a black shirt over top and let it sit outside for a day. If it changes then you know you have it the wrong way. And vice versa.

    That's the only thing I could think of otherwise. Welcome To :signs101:
     
  4. mattready

    mattready New Member

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    Oct 19, 2010
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    thats a cool idea. do they even have polaroids anymore :) i was hoping there was a marker or pen or chemical to test with.....hmmmm maybe i should come up with that?
     
  5. BIG EASY DOES IT

    BIG EASY DOES IT Very Active Member

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    Your other option could also be some sort of test with screen printing emulsion which is also UV sensitive.
     
  6. J Hill Designs

    J Hill Designs Major Contributor

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    my only problem with the above steps, is the UV will still get filtered from the 2nd surface down...they only reason for the UV protection is so the face doesnt yellow...I doubt the UV protection is 1-way only
     
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