element

Chalk

Elements · Colors & materials

Soft white limestone used to mark and write. Not lime as burned caustic, and not gypsum already on the mineral shelf.

  • Chalk is used in Medicine.

    Dioscorides’ De Materia Medica lists chalky white earths among drying and sealing drugs. First-century pharmacological use of soft white limestone-earth, not lime as burned caustic and not gypsum.

    from Pedanius Dioscorides · De Materia Medica, 1st century CE

    used in · sourced · documented

sources