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Disappearing Ink—Chemical Demonstration Kit

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

Item #: AP8894

Price: $25.40

In Stock.

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


Materials Included in Kit: 
Sodium hydroxide solution, 0.1 M, 500 mL
Thymolphthalein aqueous solution, 0.04%, 500 mL

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Planning and carrying out investigations
Analyzing and interpreting data
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Stability and change

Performance Expectations

MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.