Dustless Chalk Thanks To Recycled Scallop Shells OhGizmo
· Dustless Chalk Thanks To Recycled Scallop Shells By Andrew Liszewski Monday August 9 2022 5 62 Share on Kawasaki based company called Nihon Rikagaku has developed a new type of high quality dustless chalk by mixing finely crushed scallop shells with the traditional chalk ingredient calcium carbonate