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Pang-masa

Walang panganib na malason ng lead poisoning kapag aksidenteng natusok ng lapis. Ang pencil  na naglalaman ng clay at graphite. Ang graphite ay isang crystallized na uri ng carbon na nadiskubre malapit sa Keswick, England. Nalaman ng German che­mist na si A.G. Werner na ang graphite ay puwedeng ipangsulat. Ang graphite na mula sa Greek word na graphein na ibig sabihin ay “to write.”

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March 18, 2020 - 12:00am
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