Question: when did they replace lead with graphite in pencils
[{'answer': 'never contained the element lead', 'provenance': [{'wikipedia_id': '24508', 'title': 'Pencil', 'start_paragraph_id': 10, 'start_character': 833, 'end_paragraph_id': 10, 'end_character': 865, 'bleu_score': 1.0, 'section': 'Section::::History.:Discovery of graphite deposit.\n'}]}, {'provenance': [{'wikipedia_id': '24508', 'title': 'Pencil', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1020, 'bleu_score': 0.973998353584091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 380510249540992765}, 'section': 'Section::::History.:Discovery of graphite deposit.\n'}]}, {'provenance': [{'wikipedia_id': '24508', 'title': 'Pencil', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 380510249540992765}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24508', 'title': 'Pencil', 'section': 'Section::::History.:Discovery of graphite deposit.\n', 'start_paragraph_id': 10, 'end_paragraph_id': 10, 'meta': {'evidence_span': ['Because the pencil core is still referred to as "lead", or a "lead", many people have the misconception that the graphite in the pencil is lead, and the black core of pencils is still referred to as "lead", even though it never contained the element lead', '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"). Because the pencil core is still referred to as "lead", or a "lead", many people have the misconception that the graphite in the pencil is lead, and the black core of pencils is still referred to as "lead", even though it never contained the element lead.', 'As a technique for drawing, the closest predecessor to the pencil was silverpoint until in 1565 (some sources say as early as 1500), a large deposit of graphite was discovered on the approach to Grey Knotts from the hamlet of Seathwaite in Borrowdale parish, Cumbria, England. This particular deposit of graphite was extremely pure and solid, and it could easily be sawn into sticks. It remains the only large-scale deposit of graphite ever found in this solid form. 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"). Because the pencil core is still referred to as "lead", or a "lead", many people have the misconception that the graphite in the pencil is lead, and the black core of pencils is still referred to as "lead", even though it never contained the element lead. The words for pencil in German ("bleistift"), Irish ("peann luaidhe"), Arabic (قلم رصاص "qalam raā"), and some other languages literally mean "lead pen".']}}]}]