How to make blackboard chalk

Written by cyndee kromminga
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While blackboard chalk is pretty inexpensive, it is a lot of fun to make your own. When you make your own chalk you can use a variety of moulds to form interesting shapes. Cardboard toilet paper cores, small matchboxes and candy moulds make excellent choices for moulding one-of-a-kind blackboard chalk. Use simple sachet bags to keep the chalk in and to hang next to your blackboard. This project is a quick process and with drying time, you can be writing on a blackboard the next day. Make several sets for your blackboard memo board or give as party favour gifts for your child's class.

Skill level:

Things you need

  • Molds (cardboard toilet paper tubes, small matchbox boxes or candy moulds)
  • Craft knife
  • Masking tape
  • Tin vegetable can
  • Plaster of Paris
  • Styrofoam cup
  • Plastic spoons
  • Water
  • Tempera paint, optional
  • Sachet bags

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  1. 1

    Slice the length of a toilet paper tube with a craft knife. Overlap the edges and tightly roll the tube to form the size chalk mould you desire for a simple chalk stick. Tape the entire length of the seam with masking tape to seal. The cardboard moulds can not be reusued, so repeat with additional toilet paper tubes. Stand the tubes in a tin vegetable can to prepare for moulding.

  2. 2

    Fill the styrofoam cup 3/4 of the way full with water. Spoon heaping spoonfuls of Plaster of Paris into the cup and mix. Continue to add one spoonful of plaster at a time until your mixture is the consistency of watery pancake batter. Note: Use two plastic spoons, one for mixing and one for adding Plaster of Paris. If colour is desired, add a few drops of tempera paint to the plaster mixture.

  3. 3

    Squeeze the rim of the styrofoam cup to form a pouring spout. Pour the plaster mixture into the cardboard toilet paper tube moulds to form your blackboard chalk sticks. Lightly tap the can on your work surface to shake the plaster down into the moulds and remove air bubbles. Fill the moulds to the top and set aside.

  4. 4

    Pour more plaster into the small cardboard matchbox boxes and candy moulds. Tap the moulds on your work surface to remove the air bubbles. Allow the blackboard chalk to dry overnight.

  5. 5

    Pull the masking tape off of the cardboard tubes. Peel the cardboard from the chalk. Peel and tear the cardboard of the matchbox boxes to remove the chalk from the boxes. Slightly twist the candy mould to pop the chalk from the moulds. Place sets of the blackboard chalk into sachet bags for gifts and storage.

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