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Disappearing Ink—Chemical Demonstration Kit

By: David A. Katz, Retired, Wilmington, DE

Item #: AP8894

Price: $23.15

With the Disappearing Ink Chemical Demonstration Kit, write secret messages with disappearing ink then develop and transmit the messages. Students will be amazed as they learn about the properties of a characteristic acid–base indicator.

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This item can only be shipped to schools, museums and science centers

Product Details

It’s magic! It’s mystery! No—it’s science! Write secret messages with disappearing ink and then use chemistry to develop and transmit the messages. Students learn about the properties of a characteristic acid–base indicator and extend their understanding of pH and acid–base concepts. This demonstration is sure to engage your students’ interest. It is also a perfect activity for open-house events in the science classroom—let your students prepare special mystery ink “cards” to greet parents and visitors. Students are eager to display their growing chemical knowledge when they develop the secret messages and explain the chemical basis of the disappearing ink phenomenon to curious visitors.

Concepts: Acids and bases, pH, indicators.
Time Required: 20–30 minutes
Chemicals Provided: Thymolphthalein indicator solution and sodium hydroxide solution