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UBUKORIKORI
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Graphite Powder Ground from Plumbago
Robert M. Lavinsky (Wikimedia Commons) · CC BY-SA 3.0
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14. Ukwakira 2026FI
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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.
Utangiye
Two hours

Amabwiriza

1

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.

Ibikoresho by'iyi ntambwe:

Garafite karemanoGarafite karemano1 kg

Ibikoresho bikenewe:

Inyundo ifite umutwe wa burutaInyundo ifite umutwe wa buruta
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
Umunzani w'ibiroUmunzani w'ibiro
2

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.

Ibikoresho bikenewe:

Isekuru n'UmuhiniIsekuru n'Umuhini
Agatsiko k'utuyungurizo (imyobo itandukanye)Agatsiko k'utuyungurizo (imyobo itandukanye)
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
3

Store

Weigh the fine powder and keep it in a closed jar.

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Icupa ry'IkirahureIcupa ry'Ikirahure
4

Powder from your plumbago

Gupakira ikaye ya Jupyter…

Ibikoresho

1

Ibikoresho bikenewe

7

Iki gishushanyo gikora

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Graphite Block Sawn from Solid Natural Graphite

Graphite Block Sawn from Solid Natural Graphite

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Bidafite Ubuzima

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Plumbago Crucibles: Fire Clay, Coke and Graphite, Ure 1839

Plumbago Crucibles: Fire Clay, Coke and Graphite, Ure 1839

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Amabumba n'Ibumba

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