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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.
Beginner
About half a day
Instructions
1
1
The four stages
The four stages
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2
2
Read De Diversis Artibus, Book I
Read De Diversis Artibus, Book I
"Take linseed and dry it in a pan over the fire, without water."
3
3
Dry and pound
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.
Materials for this step:
Flax Seeds1 pieceTools needed:
Large Cooking Pot
Blacksmith Forge
Mortar and Pestle4
4
Heat with water
Heat with water
Put the meal back in the pan, pour a little water on it and make it very hot.
Tools needed:
Large Cooking PotBlacksmith Forge5
5
Press
Press
Fold it in a new cloth and press it in the press used for olive, walnut or poppy oil, in the same way.
Materials for this step:
Cotton Cloth1 pieceTools needed:
Manual Screw Oil Press
20-Liter Bucket6
6
Troubleshooting
Troubleshooting
Oil troubleshooting.
Flow
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7
7
History and honest limits
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.
Materials
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- 1 piecePlaceholder
Tools Required
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