A colloidal bismuth preparation or pharmaceutical solution used historically in medical treatment.
From 'bismuth' + 'sol' (Latin for solution, relating to colloidal suspensions). Created during the pharmaceutical era when bismuth medicines were extremely popular, combining the element with solution chemistry.
Bismuth 'sols' were the cutting-edge medicine of the 1920s-1940s—bismuth particles suspended in liquid were believed to cure almost everything from ulcers to infections, making pharmaceutical chemists obsessed with perfecting the formula!
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