How is chalk made

Make your own chalk

Who actually knows exactly what ingredients are contained in the chalk / street drawing chalk? What was it colored with? what kind of plaster used? Making chalk yourself is the easiest way to be sure that it does not contain any harmful substances.

We have tried a few options and here are the methods that have given us the best results.
When making it, you should note that the chalk needs a while to harden completely. This also depends on the outside temperature and the humidity. Oven drying did not give us good results. So it is better to start manufacturing early.

But first we need shapes into which we can pour our chalk mass.

Table of Contents

Manufacture casting molds for street chalk

1st method with paper

Material:

  • Broomstick or empty toilet roll
  • A4 sheet
  • duct tape
  • scissors

Manufacturing:

Cut the A4 sheet in half.

Depending on whether you want to make a thinner or a thicker piece of chalk, you need the broomstick or the empty toilet paper roll. Wrap the paper around the style / roll and secure it with adhesive tape. Make sure that enough edge protrudes so that you can fold it over and close the opening. Tape this very well with tape.

Remove the stick or cardboard tube.

You now have a mold for the chalk mass.

2. Waxed paper method

Material:

  • Cardboard tube
  • Wax paper
  • duct tape

Manufacturing:

Wrap the rolls with wax paper so that the coated side is facing out.

Seal the bottom well with the masking tape.

3. Silicone molds

If you don't feel like making your own casting mold, you can also use ready-made silicon molds. Molds for baking or pouring soaps are suitable, for example.

We like the fact that you can make chalk with seasonal designs, for example. Which child is not happy about Easter chalk or Santa Claus chalk ?!

Make your own chalk - recipes

The following recipe ideas are easy to implement. All recipes have one thing in common. It takes a while for the pieces of chalk to harden completely. It is worth waiting 12-36 hours!

1. White chalk

Material:

  • plaster
  • bowl
  • Cup
  • water
  • spoon

Manual:

First we prepare the shape for the chalk (see above).
The form should now be placed upright (opening facing up) and secured so that it cannot tip over (e.g. put in a glass).

Now the plaster can be mixed. To do this, 3 cups of water and 2 cups of plaster of paris are stirred with a spoon until a paste has formed. (If the paste is too thin, add a little plaster of paris.)

Then carefully let the plaster run into our mold.

Now the whole thing has to harden completely for a few days. Then the chalk is ready.

2. Cornstarch chalk

Material:

  • water
  • Cornstarch
  • Food coloring
  • bowl

Manual:

Pour equal parts water and cornstarch into the bowl. Stir the mixture until it is smooth.
Color with some food coloring.
Now pour the mixture into the prepared roll and cover the opening with wax paper.

Now you need patience. After about 12 hours, the chalk should be dry so you can remove it from the mold.

3. Make colored chalk yourself with plaster of paris

Material:

  • Model plaster (available in hardware stores)
  • water
  • Food coloring
  • Glasses
  • Cup (125 ml)

Manufacturing:

A different color is touched in each glass.

Mix 3 tablespoons of plaster of paris with about half a cup of water. The mass should be smooth, viscous and free of lumps. If the mass is too runny, add a little plaster and stir.

Carefully add the desired color and stir. Then fill into the prepared forms. Let it dry for about 12-36 hours (depending on the thickness of the chalk).

Spray chalk

Super great and something different - the spray chalk. Here you can let off steam while spraying and the next rain washes everything away again.

Easy recipe for spray chalk

Material:

  • 2 tbsp flour
  • Food coloring
  • about 120 ml of warm water
  • spray bottle

Manufacturing:

Mix the ingredients well together and pour into the spray bottle. To get intense color results you have to use a lot of food coloring. It is important that the spray chalk is used quickly, otherwise the mass will become lumpy.

Spray chalk made from cornstarch

Material:

  • 120 g cornstarch
  • 240 ml of warm water
  • Food coloring
  • spray bottle

Manufacturing:

Pour the well-mixed ingredients into the spray bottle.
After drying, the colors appear more opaque than the variant with the flour. But even here the mass clumps if you let it stand for too long.