One of the oldest metals known to humans, lead (Pb) compounds were used by Egyptians to glaze pottery as far back as 7000 BC. The toxic effects of lead also have been known for many centuries. In fact, the Romans limited the amount of time slaves could work in lead mines because of the element's harmful effects. Some consequences of lead poisoning are anemia, headaches, convulsions, and damage to the kidneys and central nervous system.
See also Lead poisoning .
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