Mar 042011
 

We were recently asked about our UV Pens; what they can write on and if you can use the ink outdoors.  Have you ever been to a club that stamps your hand with a UV stamp?  It can take a little effort to wash off the ink.  The UV ink in the pen is about as  waterproof as that.  It will endure a bit of rain but it won’t last for long.  We don’t recommend leaving your UV writing exposed to the elements. Putting it inside a container is good.  You can write on plastic, wood or metal.  Remember though that even the inside of containers get get wet. For best results we recommend non-UV reactive, cold pressed, acid free paper with self sealing pouch.

You can see from the image above that this type of paper produces a much clearer result.  White LED lights are not sufficient to get the ink to react.  You will need a UV light source in order to see the ink.  

When using our special UV paper and pouch we recommend that you write decoy text in regular ink first and then write in UV.  In this way the finder will not immediately realize what they need to do. 

We learned about using non-UV reactive paper from Avernar.