Eng., Prepared Chalk. Synonym, Drop Chalk. A native form of Calcium Carbonate freed from most of its impurities by elutriation and containing, when dried to a constant weight, not less than 97 per cent. of CaCC3.

Form

Whitish powder often moulded into cones.

Odor And Taste

Odorless and tasteless.

Solubility

Practically insoluble in water or alcohol.

Incompatibles

Acids, salicylates, alum, etc.

Average Dose

15 grains (1 Gm.).

Mistura Cretae

Eng., Chalk Mixture. Compound Chalk Powder, 20 Gm.; Cinnamon Water, 40 mils; Water, to make 100 mils.

Average Dose

4 fluidrachms (15 mils).

Pulveris Cretae Compositus

Eng., Compound Chalk Powder. Prepared Chalk, 30 Gm.; Acacia, 20 Gm.; Powdered Sugar, 50 Gm.

Average Dose

30 grains (2 Gm.).

Prepared chalk is contained in Hydrargyrum Cum Creta.

Linimentum Calcis

Eng., Lime Liniment. Synonym, Carron Oil. Equal parts of Linseed Oil and Lime Water.