• a piece of white paper
• an artist's paint brush
• baking soda
• water
• grape juice

1. Put two spoons full of baking soda into a cup. Add a cup of water. Stir.
2. Use the paint brush to paint a message on the paper, using the baking soda-water mixture as the paint. Let the paper dry completely.
3. When you want to reveal the message, brush over the entire paper with grape juice.

Which kinds of juice reveal the hidden message?

grape juice
orange juice
apple juice

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