So fun and simple to make!

Professor Figgy's Science Class from Sweet Paul on Vimeo.

you will need:

Cardboard tubes from center of paper towels or toilet paper


Duct tape

Freezer paper

Quart plastic containers (recycled deli containers work well)

Tempera paint in desired colors


Mixing spoon

Plaster of Paris

Rubber spatula

Cooling rack

  1. Cut paper towel tubes in half or use toilet paper tubes as is. Tape off one side of each tube with duct tape, being sure to completely seal the end.
  2. Cut freezer paper into 6-inch squares and line each tube with one piece.
  3. In a plastic container, mix plaster of paris as directed, in correct ratio, being sure to first mix 2 tablespoons of desired color of tempera paint with the water used to make the plaster. Mix slowly while adding Plaster to water/paint mixture, until completely combined.
  4. Using a rubber spatula to help, fill each prepared tube with the plaster mixture. Tap tube on work surface to release air bubbles.
  5. Plaster will set in about an hour, and can be removed from the tube after about two hours.
  6. To remove chalk, first peel away duct tape, then peel away the cardboard tube, and finally, peel away the piece of freezer paper.
  7. Once chalk is removed from tube, place on a cooling rack and let dry completely (1 to 3 days depending on humidity) before using.


Photography by Susanna Blavarg

Made it? Tell us about it–