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In this activity, learners explore acid and bases as they create their own invisible ink out of baking soda and grape juice. This activity includes step-by-step instructions, a video to guide learners, and a "what's going on" section that explains the science behind the activity. This activity includes low-cost materials and can be done at home.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per student

Age Range:
Ages 4 - 18

Resource Type:


Materials List (per student)

  • baking soda
  • water
  • 2 bowls or cups
  • grape juice concentrate
  • Q-tips
  • cotton balls
  • white paper


  • Physical Sciences
    • Chemistry
      • Chemical Reactions

Informal Categories

  • Crime Science


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This resource is part of:

Access Rights:

  • Free access