How to Make Chalk....

2 cups water
1/2 cups plaster of paris
2 tbs. tempura paint
paper cups

combine all ingredients. Mix well. Let mixture sit for  about 30 minutes, then mix again and pour into paper cups. I only poured small amounts, to make chalk wafers. I let it sit overnight. the next day I cut off the paper cup and pushed out the chalk. They were still somewhat soft, so i let them sit by the window still for another hour.