Conte found the answer in 1795.By mixing refined graphite powder with clay, then heating it,he produced a firm hard lead. German researchers later perfected the method.

• 1795年，康特找到了问题的答案。把经过精炼的石墨粉末混合以泥土，然后进行加热烧结，他生产出了牢固而坚硬的“铅”。德国的研究员其后又完善了这一方法。