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Engineer's Blue: Prussian Blue Ground into a Marking Paste
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Martin

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Martin

14. Ukwakira 2026NO
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Engineer's Blue: Prussian Blue Ground into a Marking Paste

Engineer's blue is a heavily pigmented paste that shows where two surfaces touch: smear it thinly on a true flat, rub the work on it, and the blue comes off only on the high spots, which are then scraped down. Joseph Whitworth made accurate flat surfaces this way in the 1830s. It is Prussian blue ground into a grease. The picture: how the blue marks the high spots (our drawing).
Utangiye
Half an hour

Amabwiriza

1

Soften the grease

Warm the tallow just until it softens.

Ibikoresho by'iyi ntambwe:

Ibinure by'InyamaswaIbinure by'Inyamaswa60 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Urubaho rushyushyaUrubaho rushyushya
2

Grind in the pigment

Put Prussian blue on a glass slab, add the soft grease a little at a time and grind it with a muller until the paste is smooth and deep blue, with no grit: about one part pigment to three of grease (our proportion).

Ibikoresho by'iyi ntambwe:

Ubururu bwa PrusiyaUbururu bwa Prusiya20 g

Ibikoresho bikenewe:

Ikibaho cy'ikirahureIkibaho cy'ikirahure
Urusyo rw'IkirahureUrusyo rw'Ikirahure
Ibikoresho by'ibyuma byo kuvanga irangiIbikoresho by'ibyuma byo kuvanga irangi
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
3

Tin it and test

Scrape it into a small tin with a lid. Test it: smear a film thin enough to be translucent on a flat plate, rub a part on it, and only the touching spots should pick up blue.

Ibikoresho bikenewe:

Ikopo ry'icyumaIkopo ry'icyuma
Ibikoresho by'ibyuma byo kuvanga irangiIbikoresho by'ibyuma byo kuvanga irangi

Ibikoresho

2

Ibikoresho bikenewe

7

Iki gishushanyo gikora

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Agateganyo

Irangi ry'ubururu ryo kuranga

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Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

Making Prussian Blue — The First Modern Synthetic Pigment (Berlin, 1704)

Making Prussian Blue — The First Modern Synthetic Pigment (Berlin, 1704)

na CharlieDE

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CC0 Umurenge rusange

Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.

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