In the west, giant chalk (also known as Sidewalk Chalk) is commonly used by folk artists in street performances. Here we introduce a method of making hard but not brittle quick dry chalk. You can make different sizes and colors of chalk according to this formula. Materials needed: tempera paint, Paris powder plaster, fresh film core tube, wax paper, sealing tape, plastic bag, scissors.

　　1. 将保鲜纸切成12-13厘米的小块，用蜡纸包起来，一端用胶带封好，另一端放好。2. 重复几个密封纸芯模具。3.现在粉笔比例和颜色混合:将2到3汤匙蛋彩画和1/2杯水混合，加入3/4杯巴黎石膏，用勺子充分混合。然后，将混合物倒入塑料袋中，在塑料袋底部开一个口，将颜料挤进一个有封底的纸筒中。4. 等待粉笔干燥，在室温下至少12小时。完全干燥后，从粉笔上取下管子。这样就做完了。

　　1. Cut the paper into 12-13cm small pieces, wrap them with wax paper, seal one end with tape, and put the other end. 2. Repeat several sealing paper core molds. 3. Now mix the chalk proportion and color: Mix 2 to 3 tablespoons of tempera with 1 / 2 cup of water, add 3 / 4 cup of Paris plaster, and mix well with a spoon. Then, pour the mixture into the plastic bag, make an opening at the bottom of the bag, and squeeze the pigment into a paper cylinder with a back cover. 4. Wait for the chalk to dry at room temperature for at least 12 hours. When completely dry, remove the tube from the chalk. This is done.

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