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Linseed Oil: Roasted, Pounded, Steamed and Hot-Pressed in a Cloth (Theophilus, 12th Century)
Youblob (drawing after Theophilus) · Public domain
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14. Ugushyingo 2026SE
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Linseed Oil: Roasted, Pounded, Steamed and Hot-Pressed in a Cloth (Theophilus, 12th Century)

How Theophilus made linseed oil for painting panels (12th century): linseed dried in a pan over the fire, pounded to a fine meal in a mortar, heated again with a little water, folded in a new cloth and pressed in the same press used for olive, walnut or poppy oil.
Utangiye
About half a day

Amabwiriza

1

The four stages

Gupakira ikaye ya Jupyter…
2

Read De Diversis Artibus, Book I

"Take linseed and dry it in a pan over the fire, without water."
3

Dry and pound

Dry the linseed in a pan over the fire without water. Put it in a mortar and bruise it with the pestle to a very fine powder.

Ibikoresho by'iyi ntambwe:

Imbuto za linImbuto za lin1 igice

Ibikoresho bikenewe:

Inkono NiniInkono Nini
Uruganda rw'umucuziUruganda rw'umucuzi
PipetiPipeti
4

Heat with water

Put the meal back in the pan, pour a little water on it and make it very hot.

Ibikoresho bikenewe:

Inkono NiniInkono Nini
Uruganda rw'umucuziUruganda rw'umucuzi
5

Press

Fold it in a new cloth and press it in the press used for olive, walnut or poppy oil, in the same way.

Ibikoresho by'iyi ntambwe:

Umwenda w'IpambaUmwenda w'Ipamba1 igice

Ibikoresho bikenewe:

Imashini ya sikuru ikanda amavuta ikoreshwa n'intokiImashini ya sikuru ikanda amavuta ikoreshwa n'intoki
Indobo ya Litiro 20Indobo ya Litiro 20
6

Troubleshooting

Oil troubleshooting.

Flow

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7

History and honest limits

From Theophilus, **De Diversis Artibus**, Book I, chapter XX, translated by Robert Hendrie (1847) (checked on the archive.org scan essayuponvarious00hend, p. 25). He uses the oil to grind minium or cinnabar for red panels; those lead and mercury pigments are left out here. The tools and the diagram are ours.

Ibikoresho

2

Ibikoresho bikenewe

5

Iki gishushanyo gikora

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Glue of Skin Cuttings and Stag Horn, Simmered Four Times and Tested on the Fingers (Theophilus, 12th Century)

Glue of Skin Cuttings and Stag Horn, Simmered Four Times and Tested on the Fingers (Theophilus, 12th Century)

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