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Man applying glaze to bisqueware in a pottery factory

Man applying glaze by hand to bisqueware (fired-once clayware) in a West Virginia pottery factory by holding the piece of pottery and dipping his hand into the tub of glaze, which contains lead. (Source: CDC/Barbara Jenkins, NIOSH, 1936. Flinn RH. Neal PA, Reinhart WH, Dallavalle JM. Fulton WB, Dooley AE. Chronic manganese poisoning in an ore-crushing mill. Public Health Bulletin 1940;247:1-77. Public Health Image Library, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)