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Invisible Ink


Source Institutions

    Oregon Museum of Science and Industry

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Invisible Ink

In this hands-on activity (on page 2 of the PDF), learners experiment with lemon juice and paper to create a message that can only be revealed using chemistry. Using an oven as a heat source (requires adult supervision and assistance), learners discover that different things combust at different temperatures since the lemon juice browns and the paper does not. This in one of three activities in the Take Home guide for the Chemistry of Toys unit in OMSI's Chemistry Lab. Also included in the PDF are: Chalk It Up and Flubber.

Quick Guide


Preparation Time:
5 to 10 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
1 cent - $1 per student

Age Range:
Ages 6 - 14

Resource Types:
Activity, Experiment/Lab Activity

Language:
English

Materials List (per student)


  • lemon juice
  • one piece of paper
  • one small brush or cotton swab
  • oven

Subjects


  • Physical Sciences
    • Heat and Thermodynamics
      • Heat and Temperature
    • Chemistry
      • Acids and Bases
      • Oxidation-Reduction Reactions

Informal Categories


  • Crime Science
  • Food and Cooking

Audience


To use this activity, learners need to:

  • see
  • see color
  • read
  • touch

Learning styles supported:

  • Involves hands-on or lab activities

Other


This resource is part of:

Access Rights:

  • Free access

By:

Rights:

  • All Rights Reserved, Oregon Museum of Science and Industry, ©1997

Funding Source:

  • National Science Foundation

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