Light reactive ink
Light reactive ink
Out of context: Reply #6
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- 2michaelt0
http://www.veer.com/ had a postcard marketing their "green" endeavors surrounding invisible ink which was printed on recycled cardstock. When held in the sunlight the invisible ink darkened and became visible. The "special ink" exists, however, I do not know what the process is called or the name of the ink. Contact Veer and ask about a postcard sent they sent with sunlight-activated ink.