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indigo carmine

n :  a soluble blue dye C16H8N2Na2O8S2 that is a sodium salt, is used chiefly as a biological stain and food color, and since it is rapidly excreted by the kidneys is used as a dye to mark ureteral structures (as in cystoscopy and catheterization) .

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Blue Mountain Hospital (John Day, Oregon - Grant County)