Mount Vernon is open to visitors throughout the inauguration week.  We look forward to seeing you.

During the American Revolution, invisible ink was an important method of communication for spies on both sides.

Ingredients and Supplies

Ingredients and Supplies

¼ cup baking soda ¼ cup water Grape Juice Paper Something to write with- a cotton swab, toothpick, or paintbrush all work well.

Recipe courtesy of the book Invisible Ink: Spycraft of the American Revolution by John Nagy

Step 1 - Mix

Mix ¼ cup baking soda and ¼ cup water.

Step 2 - Wet your brush

Dip a cotton swab, toothpick or paintbrush into the mixture.

Step 3 - Write your message

Write a message on a white piece of paper and allow it to dry.

Step 4 - Apply the decoding stain

Dip a cotton swab into grape juice concentrate or any dark juice and paint it over the invisible message.

Step 5 - Reveal the message!

Wait for your message to appear.

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