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In this activity, learners will use chemistry to create a night sky watercolor painting. They will experiment to learn the effects of mixing crayon, salt, and lemon juice with water color paints. ACtivity includes step-by-step instructions for how to use what they learned to create their own painting.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
30 to 45 minutes

Estimated Materials Cost:
$5 - $10 per student

Age Range:
Ages 4 - adult

Resource Type:


Materials List (per student)

  • cup of water
  • watercolor paint
  • paint brushes
  • paper
  • lemon juice
  • white crayon
  • fine and coarse salt
  • paper towels
  • Optional: masking tape or painters tape, newspapers or an outdoor space to reduce the cleanup time


  • Physical Sciences
    • Chemistry

Informal Categories

  • Arts and Crafts


Components that are part of this resource:

This resource is part of:

Access Rights:

  • Free access


Source Collection

  • COSI Connects


  • All rights reserved, COSI, 2021

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