Sidewalk chalk is typically large and thick sticks of chalk made of calcium sulfate (gypsum), instead of calcium carbonate (rock chalk). It comes in multiple colors and is mostly used for drawing on pavement or concrete sidewalks, frequently four square courts or hopscotch boards.
Sidewalk chalk is typically large and thick sticks of chalk made of calcium sulfate (gypsum), instead of calcium carbonate (rock chalk). It comes in multiple colors and is mostly used for drawing on pavement or concrete sidewalks, frequently four square courts or hopscotch boards.
Source: Wikipedia "Sidewalk chalk" · CC BY-SA 4.0
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