If you don't want to drink red cabbage juice, here's another use for it—a decoder! Using vinegar and ammonia-based window cleaning liquids as invisible inks, scholars create designs in the second lesson of the series. Red cabbage juice becomes the key to uncovering the designs.

Concepts

acids, bases, acids and bases, harry potter, indicators, ammonia, baking soda

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Additional Tags

science

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Instructional Ideas

• Have learners write secret messages to each other in invisible ink

Classroom Considerations

• A variety of liquids is necessary, such as red cabbage juice; see materials section for complete list
• Be sure to check district policy before showing video clips of movies

Pros

• Provides a list of investigating questions to use with pupils during discussion and activity
• Activity is fun and engaging

Cons

• None