Methylene blue was identified by Paul Ehrlich around 1891 as a possible treatment for malaria. It fell out of use as an anti-malarial during World War II in the Pacific, as American and Allied soldiers disliked its reversible side effects: blue coloration of the urine and sclera (the whites of the eyes).
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Posts made by chum022
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RE: Can MB oral ingestion turn whites of eyes blue?