Together, they make the substance, calcium phosphate. Sidewalk chalk is made from calcium and sulfate, which makes calcium sulfate. One of the most common chemicals connected to calcium is called ...

Chalk lettering is a beautiful art form that blends typography and illustration, with chalk serving as the primary medium.

A local artist who was arrested in San Antonio earlier this year for using washable chalk at a bus stop has started a petition demanding the city cease arrests and citations related to sidewalk art.

EASTON, Pa. - The sidewalk outside of Crayola Experience looked pretty colorful on Tuesday. Kids young and old got down and enjoyed some good old-fashioned chalk art for National Chalk the Walk Day.