All Field Marking Chalks Are Not Created Equal | Beacon ...
Dec 09, 2019· All Field Marking Chalks Are Not Created Equal. Dec 9, 2019 · Paul Zwaska Differences in Marking Chalk Dry line products used for marking lines on ballfields usually come from one of two types of stone, limestone or marble. Limestone is a sedimentary rock while marble is a metamorphic rock that is formed when heat and pressure are exerted on a limestone deposit, such as during the .