Free Shipping on Orders over $199
Due to extreme weather, the Flinn Warehouse is not shipping today, 1/23/2026.
We expect to resume normal shipping on Monday, 1/26/2026.
We regret this inconvenience. For more information, please call us at 800-452-1261.
DC91084
Price: FREE
It’s magic! It’s a mystery! No—it’s science. Students write secret messages using a disappearing ink sample and then use chemistry to develop and transmit the messages. This activity allows students to explore the properties of a characteristic acid–base indicator, thymolphthalein, and to extend their understanding of pH and acid–base concepts.
1-800-452-1261
