The goal is to cover the blue message enough that it is no longer readable to the naked eye. The red ink should look like a chaotic jumble of lines or shapes.
On a separate piece of white paper, write your secret message using a . Keep the letters clear and thin. Create the "Red Noise" Camouflage (10 Mins) DECODE RED - Part 222:26 Min
Place your red decoder lens over the paper. The red filter will make the red marker "disappear" into the background, while the blue or green text will appear dark (nearly black), making the secret message clearly visible. Alternative Method: Invisible Ink The goal is to cover the blue message