Upstream | October 06, 2009 | 0 comments

7 Amazing Types Of Invisible Ink & How You Can Use Them

source: http://www.relaxinghub.com/2009/06/7-amazing-types-of-invisible-ink-how.html

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james106
Some types of invisible ink are right there in your kitchen cupboard!
  1. groups:
    Upstream,   Max and Jason: Still Up
  2. tags:
    Science,  Ink,  cyptography
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