Invisible Ink Pen Pals Soda

This DIY is a great way for your kids to mail secret messages to friends they haven't seen in a while. From ARM & HAMMER™ Summer Camp Counselor Amber Kemp-Gerstel

• ½ cup ARM & HAMMER™ Baking Soda
• ½ cup water
• White printer paper
• A safe heat source, like a light bulb (optional)
• 8 ounces purple grape juice
• Paintbrush
• Measuring cups

1. Mix equal parts water and ARM & HAMMER™ Baking Soda.
2. Dip a paintbrush in the solution and use to write a message on your white printer paper. For example, “Let’s order pizza tonight.”
3. Allow the ink to dry.
4. To reveal your secret message, you have two options: You can gently paint over the message with purple grape juice, or you can hold the paper up towards a light bulb or other heat source.