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Foto4.2 / 1126 votes When naturally occuring graphite was discovered, chemistry was in its infancy and the substance was thought to be a form of lead. Consequently, it was called plumbago (Latin for "lead ore") . The black core of pencils is still sometimes referred to as "lead," even though it never contained the element lead. | Enigmas recentesTue Bulldog Cut SignSegunda-feira Llama Bad Hair DaySol Lion Head PadlockSentado Colorful FlutesFri Temple on HillThu Triple Ball LightWed Duckling Furballs Enigmas mais precedentes | |||||||
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