Sidewalk chalk are typically large colored (and sometimes white or cream) sticks of chalk (calcium sulfate rather than rock chalk, calcium carbonate) mostly used for drawing on pavement or cement sidewalk. It is sometimes used by children to draw a four square court or a hopscotch board. Blackboard chalk is typically shorter.

There are several different types of sidewalk chalk, typically coming in solid-colored sticks. 3-D sidewalk chalk sets, in which each stick of chalk is created with two particular colors that appear 3-dimensional when viewed through the 3-D glasses that come with the chalk, also exist.

Sidewalk chalk can be cheaply homemade.

Read more on

Guides that use

Checking rack and pinion steering

Part of a steering rack check involves raising the front of the car but retaining its weight on ...

Adjusting toe alignment on wheels

Front wheels wrongly aligned cause uneven tyre wear and may seriously affect the car's handling....

Stroboscopic timing

A static timing check with the engine stationary is never fully accurate. It does not allow for ...

Checking the steering box

A steering box check involves raising the front of the car but keeping its weight on the wheels,...

How to align headlights at home

Only a garage with special equipment can align headlamps accurately. However, you may need to do ...

здесь www.profvest.com

источник