1, choose chalk. Chalk is a kind of limestone. Because it is rich in calcium, its natural color is white. Because of its hard texture, it is a good tool for writing and painting. Chalk pigment can be made of any chalk.

Ordinary white chalk used by teachers in class can be bought in offices, pharmacies and grocery stores. You can also choose thick chalk for street graffiti. Go to the store to buy a box of colored chalk. You can also buy special chalk for painting in boutique art shops. This kind of chalk has more colors to choose from.

2. Grind the chalk into powder. Chalk is fragile and easily ground into powder. One and a half pieces of chalk can grind out a small cup.

The method of grinding chalk is as follows: use a grinder. Put the grinder at the mouth of the bowl and grind the chalk back and forth on the grinder, and the powder will fall into the bowl. Use a brush. Put the brush horizontally at the bowl mouth and rub it back and forth with chalk on the rough part of the brush bar. Use a hammer. Put the chalk in a plastic bag and seal it. Knock the chalk in the bag with a hammer until it turns into powder, and then pour the powder into the bowl.

3. Add water to the powder. Add one teaspoon of water at a time and several times, while stirring until the mixture becomes glue. You don't need much water to make chalk pigment. If you add too much paint, it will be too thin.

4. Note: You don't need much water to make chalk pigment. If you add too much paint, it will be too thin. If you add more water, you can add more powder to make up for it.

5. Knead the mixed paste into a favorite cake model and add decorations to make a beautiful cake.

How to make chalk pigment easily: put a sealed plastic bag into another sealed plastic bag. Please choose a large non-porous cold storage bag. Put the colored chalk in a plastic bag and seal it. Gently break the chalk with a hammer until it becomes fine powder. You may need to beat the chalk for a few minutes to get the powder you want.

Break the chalk as much as possible. The pigment made of blocky chalk will be blocky, and chalk powder will produce finer and smoother pigment. You can also add another kind of colored chalk and mix it into a new color. Pour the powder into a paint box or other clean container. Slowly add water with a teaspoon, and stir the chalk powder with a blender or stick until it forms a fine paste. The smoother the paste, the smoother the pigment.

Pour the white glue into the paste and stir well. Stir constantly and add water slowly until you reach the required concentration. You may need to add 3 tablespoons or more water to get the desired concentration. Try to make the pigment have a consistency similar to that of white glue or thinner.