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Graphite Powder Ground from Plumbago
Plumbago, the black lead of Borrowdale, is natural graphite: soft, lead-grey and greasy, it cuts with a knife and blackens the fingers. Andrew Ure (1839) lists its uses against friction, for crucibles and for glossing cast iron. Pick it clean of rock, grind it and sift it to a fine powder. Wear a dust mask.
The picture: a lump of natural graphite.
初学者
Two hours
说明
1
1
Dress the lumps
Dress the lumps
Break the plumbago with a hammer and pick out the pieces of rock, as the Borrowdale miners sorted and dressed it by hand.
此步骤所需材料：
天然石墨1 公斤所需工具：
圆头锤
橡胶手套
等臂天平2
2
Grind and sift
Grind and sift
Grind the clean pieces in the mortar a handful at a time and shake them through the sieves, finest last. Grind what stays on the sieves again.
所需工具：
研钵与研杵
筛组（分级筛网）
防尘口罩橡胶手套3
3
Store
Store
Weigh the fine powder and keep it in a closed jar.
所需工具：
等臂天平
玻璃罐4
4
Powder from your plumbago
Powder from your plumbago
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