It can be because some sidewalk chalk contains lead.
A major component of sidewalk chalk is calcium carbonate, CaCO3
Sharon McKay invented sidewalk chalk, after she wrote books that included it.
colored chalk sidewalk chalk dustless chalk
ya i think so... type in "how to chalk your hair with sidewalk chalk" and the first website to pop up will probably be "the mane dish"... click that and TA DA
Yes, both sidewalk chalk and blackboard chalk are typically made of calcium sulfate. However, sidewalk chalk is often mixed with additional ingredients like pigments and binding agents to make it more durable for outdoor use.
Hello I deleted the answer... Your welcome DB
Sidewalk chalk can be made with just flour and water. It can be fancied up with the addition of cornstarch or food coloring. Sidewalk chalk is fun for children to use.
16th century
It typically takes several hours for sidewalk chalk to dissolve in soda, depending on the size of the chalk piece and the type of soda used. The process may be accelerated by stirring or crushing the chalk pieces.
Its regular chalk made by the Crayola corporation. The chalk is also larger in diameter than chalk for a blackboard to make it sturdier.
Sidewalk chalk is made up on calcium carbonate, which is a mild alkaline substance (a base). Acids corrode metals, bases do not. Therefore, sidewalk chalk should not rust metal.