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UVPen.jpg

Here is a nice round-up of some simple sneaky inks. The old favorites like lemon juice and vinegar are there, but also some more sophisticated systems using stuff like cerium oxalate and iodine fuming.

From the pages of MAKE:

MakeVol16InvisibleInkPrinter.jpg

Mike Golembewksi shows us how to make an invisible inkjet printer in MAKE 16 – Spy Tech.

More:

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I write for MAKE, serve as Technical Editor for MAKE magazine, and develop original DIY content for Make: Projects.


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