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Solve times for this jigsaw puzzleShare your solve times with your buddiesPhotoWhen 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. SharePuzzle PostcardE-mail this puzzle to a friend with your personal message and choice of puzzle cut. | ||
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