Secret ink smorgasboard

Science
Secret ink smorgasboard
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:

3 thoughts on “Secret ink smorgasboard

  1. Rick says:

    You can also do the following simple procedure:

    Wet a sheet of paper – Put a dry sheet on top and write message with a ball point pen or pencil.

    Destroy top sheet, (to keep the secret), when dry the lower paper seems blank so write something innocent on it.

    To develop the writing wet the sheet again and the secret message is visible when you hold up to the light.

    1. Sean Michael Ragan says:

      Good one! Thanks. I’m thinking some more secret ink content may be in order.

  2. Indusia says:

    There is no such thing as secret ink, everything is now available to public.
    Internet_ink

    Units 2/3 Debdale Trading Estate Debdale Lane
    Keyworth Nottingham NG12 5HN
    (0115) 937 1520

Comments are closed.

Tagged

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c't – Magazin für Computertechnik, and The Wall Street Journal.

View more articles by Sean Michael Ragan
Send this to a friend
FEEDBACK