TANNAGE. Manuscript, Notes pour l'application... - Lot 337 - Ader

Lot 337
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Estimation :
150 - 200 EUR
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Result : 320EUR
TANNAGE. Manuscript, Notes pour l'application... - Lot 337 - Ader
TANNAGE. Manuscript, Notes pour l'application du procédé de tannage de Mr. Félix Boudet, [ca. 1840]; 5 pages in-4, marginal annotations in ink or pencil. Exposé d'un nouveau procédé de tannage. Tanning, which consists of treating hides to transform them into leather, is made up of 4 distinct operations: pelanage, dehairing, swelling, and tanning proper, or putting into pits. Around 1840, the pharmacist Félix BOUDET (1806-1878) improved the first two operations by substituting caustic soda for lime, which made it possible to obtain softer leather in half the time: "Fourteen kilograms of soda crystals should be pressed. of soda crystals, break them up, crush them, dissolve them in about fifty liters of water, then add, when the solution is complete, seven kilograms of anhydrous caustic lime, which will have been previously slaked and then diluted with a sufficient quantity of water to form a fluid slurry. This mixture will be made in a tub or barrel with a lid, in which it will be left for at least 6 hours, so that the soda crystals can be completely decarbonated. [Then] the whole thing will be poured into a vat, in other words into the plain, in which we will have previously put fifteen to sixteen hundred liters of water [...]. Once this is done, the skins will be successively thrown into the plain [...], taking care to spread them out in layers as much as possible, and they will be left in contact with the liquor for 36 or 48 hours, more or less, until the hair comes off easily"... Etc.
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