Secret Message

Source Institutions

COSI

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.

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:: Activity
Language:: English

Materials List (per student)

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

Keywords

ink
invisible
chemical reaction
grape juice
color

Subjects

Physical Sciences
- Chemistry
  - Chemical Reactions

Informal Categories

Crime Science

Other

Components that are part of this resource:

COSI Teachback guide
COSI Workshop: Phenolphthalein

This resource is part of:

COSI Connects

Access Rights:

Free access

By:

COSI