<P> Although lead has not been used for writing since antiquity , lead poisoning from pencils was not uncommon . Until the middle of the 20th century the paint used for the outer coating could contain high concentrations of lead , and this could be ingested when the pencil was sucked or chewed . </P>
<P> Although lead has not been used for writing since antiquity , lead poisoning from pencils was not uncommon . Until the middle of the 20th century the paint used for the outer coating could contain high concentrations of lead , and this could be ingested when the pencil was sucked or chewed . </P>
when did they stop using lead in pencils
when did they stop using lead in pencils
the middle of the 20th century
the middle of the 20th century