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”http://www.youtube.com/watch?v=oU2PkF9QLTQ&feature=youtube_gdata”
Direct from MAKE Volume 16, this project shows you how to mod your printer so that it prints with invisible ink.
More information, including a PDF of the instructions can be found here: http://blog.makezine.com/archive/2011/04/how-to-for-secret-agents-invisible-ink-printer-mod.html
