This was fun activity that I got from Roper Mountain Science Institute. They suggested red theater gel to reveal the message, which can get pricy. Another idea I heard was to ask movie theaters to donate left over 3D glasses, which also have a red filter. A guest speaker we had last year said red jello would work. Tried it this week and it worked like a charm. The students thought it was very cool. I found my "attention challenged" students had trouble focusing on making their own secret messages so I was very glad that I had made extra copies of the sheets from the GEMS Color Analyzer book that they could color and then check under the jello.
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Here is the link - http://www.teacherspayteachers.com/Product/Paper-Pull-Out-Template
Please do not feel obligated to purchase. I really took an idea I saw and modified for use in the notebook. It can be easily duplicated on your own but if you want a set template please feel free to head to the Teachers Pay Teachers site.