All Field Marking Chalks Are Not Created Equal | Beacon
#0183;#32;All Field Marking Chalks Are Not Created Equal. May 14, 2020 #183; 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