the best science on the web about
invisible inks

The Sordid Secrets of Invisible Ink
Image: iStockphoto.com/kertlis

The Sordid Secrets of Invisible Ink

Invisible ink — the most popular tool for sending hidden messages, known as steganography — has been around for more than 2000 years.

Explore the three methods used for this secret writing, heat, light, and chemistry. Then see how people are using invisible ink for private security.

io9
Loading...
CIA Declassifies Invisible Ink Recipes from WWI

CIA Declassifies Invisible Ink Recipes from WWI

Find out how to create “German secret ink,” read vanishing messages, and make invisible words reappear. More...

Images
History Channel
Disappearing Ink

Disappearing Ink

Here's a twist: An ink stain that vanishes in the presence of carbon dioxide. Explore the chemistry behind disappearing ink by watching (not trying!) this experiment. More...

Video
Steve Spangler Science
‘Unknown Heroine’ Who Caught Invisible Ink Spy

‘Unknown Heroine’ Who Caught Invisible Ink Spy

Her identify was concealed at the time she helped foil a WWI spy plot, but now Mabel Elliott is finally being recognized by the Royal Society of Chemistry. More...

Profile
BBC
Disappearing Ink

Disappearing Ink

Invisible words appear, thanks to lemon juice and a light bulb. But will they disappear again? More...

Article
Newton/Department of Energy
Invisible Ink for the 21st Century

Invisible Ink for the 21st Century

Take a look at a new use for invisible ink: hidden writing for anti-theft labels. More...

Article
Royal Society of Chemistry
Invisible Ink Reveals Cool Chemistry

Invisible Ink Reveals Cool Chemistry

Mix up a batch of invisible ink and send your own top secret message using lemons, a concept used by George Washington's army. More...

Activity
Scientific American
PacSci-Doku: Secret Messages

PacSci-Doku: Secret Messages

Solve this Sudoku-inspired puzzle to find out what machine was used to send secret messages during World War II. More...

Game
Pacific Science Center
Steganography: How to Send a Secret Message

Steganography: How to Send a Secret Message

The art of sending well-concealed messages, steganography has been practiced since ancient times to provide the utmost in secrecy. Explore this "dark cousin" of cryptography, the use of codes. More...

Article
strangehorizons.com
Super Simple Heat-Activated Invisible Ink

Super Simple Heat-Activated Invisible Ink

Gather just four items and squeeze out your own batch of invisible ink. And be cautious, very cautious, with your source of heat! More...

Activity
instructables.com
Three Recipes for Making Invisible Ink

Three Recipes for Making Invisible Ink

Thin corn starch, mashed potato, or rice gravy; baking soda; and lemon juice: Try these three ways to concoct your own invisible ink. What secrets will you write? More...

Activity
About.com

Latest Comments

You Also Might Like

  1. non-Newtonian fluids

    non-Newtonian fluids

  2. cooking chemistry

    cooking chemistry

  3. thin films

    thin films

  4. hydrogels

    hydrogels

  5. Halloween

    Halloween