Make Your Own Sidewalk Chalk With Radical Rick on Extreme Scienc - Spokane, North Idaho News & Weather KHQ.com

Make Your Own Sidewalk Chalk With Radical Rick on Extreme Science

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What you will need:

  1. Plaster of Paris
  2. Water
  3. Tempera paint
  4. Mixing bowl
  5. Mixing spoon
  6. Plastic popsicle molds or other type of molds
  7. And eventually……… a sidewalk to decorate
  8. Adult supervision

Procedure:

1) Pour some of your plaster of paris into your mixing bowl.

2) Add water and paint

3) Stir until thoroughly mixed. Do not stir too fast as you do not want to create a lot of air bubbles

4) Try spraying a little bit of non-stick spray into your molds if you are using plastic molds. The ones we used to record this segment worked but were a little harder to get out than they have been in the past so adding a thin coating of non-stick spray would probably help.

5) Carefully pour your mixture into the molds. I like to use the round popsicle molds but you could even get creative and use plastic Easter eggs for molds and end up with egg shaped chalk.

6) Let harden. This may take a couple of days. If you try to get them out too soon, they may break. They will also shrink slightly as they dry which makes them easier to get out of the molds.

7) Once your sidewalk chalk has hardened, you may remove each of them from the molds.

8) Go get creative and decorate some sidewalks!

PLEASE NOTE: I had a hard time getting my chalk out of the molds this time. Typically, they will come out fairly easy once they have completely dried but I had a hard time with this batch and am not really sure why. I may have been a little impatient but in order to save you frustration, you may want to try spraying some non-stick spray into your molds or roll up some wax paper to insert into the mold prior to adding your plaster!

What is going on?

Plaster is actually a building material typically used for coating walls and ceilings. Plaster of Paris is sold in a powder form and is intended to be mixed with water to form a paste. Mixing your plaster powder with water will release heat through crystallization and your hydrated plaster will then harden as it dries out. Plaster is relatively soft after it dries, which makes it easy to work or sand after it is dry. These characteristics make it similar to chalk, or sidewalk chalk. By adding paint to this mixture, we can color the plaster to make your own custom sidewalk chalk!

Try this:

As you fill your various molds, you may end up with some hydrated plaster left over but not have quite enough to fill another mold. Go ahead and pour it into a mold and continue to do so with each color you make so that you will end up with a “rainbow” piece of sidewalk chalk as well.

Radical Rick
Extreme Science
www.ExtremeScienceFun.com
509-892-7621

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