Use the recipe that follows. If the children are young, parents should measure the dry ingredients into baggies before the children arrive. Measure and add the water when you are ready to make the chalk. Children can mix the mixture in the baggie while parents cover 1 end of each tube with the duct tape. Then snip a hole in 1 corner of the baggie and pour the mixture into each tube.

Older children can cover the ends of their tubes first, then measure and mix ingredients.