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Metals
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Tetraethyl lead (PbEt4) is still used in some types of gasoline, but it gradually abandoned for environmental reasons. There are still lead pipes bearing the insignia of Roman emperors, used as the spa drains.
Ancient symbols used by alchemists of lead
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The lead is a lustrous, bluish-white. It is very soft, highly malleable, ductile and a poor conductor of electricity. It is very resistant to corrosion, but it oxidizes and turns black when exposed to air. Alloys include pewter and solder.
