Recently Cole and his associates1 proved chemically that bismuth suspensions when dispensed in bulk for intramuscular use yield individual doses of uneven bismuth content. They suggested the need for mechanical mixing in addition to glass beads. In order to achieve this purpose the widely available Kahn shaker for laboratory use in the Kahn precipitation test for syphilis may be adapted for the mechanical shaking of metallic suspensions used in treatment.
Beerman H. A MECHANICAL SHAKER FOR BISMUTH SUSPENSIONS. Arch Derm Syphilol. 1932;26(5):886–887. doi:10.1001/archderm.1932.01450030887015
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