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In page List of munition workers who died of TNT poisoning:

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Shells were filled with a mixture of TNT (the explosive) and cordite (the propellant),[citation needed] and even though these ingredients were known to be hazardous to health, they were mixed by hand so came into direct contact with the workers' skin. The chemicals in the TNT reacted with melanin in the skin to cause a yellow pigmentation, staining the skin of the munitions workers. Although unpleasant, this specific side effect was not dangerous and the discolouration eventually faded over time with no long-term health effects.