As a disinfectant, chlorine was first used about the year 1800 by de Morveau, in France, and by Cruikshank, in England, who prepared the gas by heating a mixture of hydrochloric acid and potassium bichromate or pyrolusite; this is essentially the same as the original mixture used by Scheele.
"Chlorination of Water"
Joseph Race
Generally resembles pyrolusite, but is distinguished from it by its superior hardness.
"The Elements of Blowpipe Analysis"
Frederick Hutton Getman
Heated in an ignition tube yields water in abundance, otherwise it behaves like pyrolusite.
"The Elements of Blowpipe Analysis"
Frederick Hutton Getman