1. Dip a cotton swab into the ink and use it to write the secret message on a piece of paper.

2. Allow the message to dry completely.

3. To read the invisible ink, spray the message with the red cabbage water solution.

To make the solution:

a. Chop the large red cabbage into small pieces.

b. Simmer the cabbage pieces in hot water until it turns into a deep shade of purple.

c. Allow the water to cool, and refrigerate it when not in use.

Be careful with the red cabbage solution, because it can stain your clothes!