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Blue lead line on gums

"M.W. had entirely lost the blue line on her gums. Circumstances obliged her to return to the lead factory; after working there 1 week, she came to the infirmary suffering from colic." (Source: Oliver T. Lead poisoning in its acute and chronic forms: The Goulstonian Lectures, delivered in the Royal College of Physicians, March 1891. Edinburgh and London: Young J. Pentland, 1891. Public domain.)

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