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Invisible Ink Demonstration


Source Institutions

    The Science House

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Invisible Ink Demonstration

In this chemistry demonstration, learners will discover that phenolphthalein is a chemical that displays different colors depending on the acidity or basicity of the environment. Learners will be surprised to see a "secret message" appear in bright pink ink when it is sprayed with Windex containing ammonia (a base). They compare this to what happens when the message is sprayed with Windex containing acetic acid (nothing!).

Quick Guide


Preparation Time:
5 to 10 minutes

Learning Time:
Under 5 minutes

Estimated Materials Cost:
$5 - $10 per group of students

Age Range:
Ages 6 - 18

Resource Types:
Activity, Demonstration, Experiment/Lab Activity

Language:
English

Materials List (per group of students)


Subjects


  • Physical Sciences
    • Chemistry
      • Acids and Bases
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations

Informal Categories


  • Crime Science

Audience


To use this activity, learners need to:

  • see
  • see color

Learning styles supported:

  • Involves hands-on or lab activities

Other


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