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Tannic Acid: Chinese Galls Extracted with Warm Water, Shaken with Ether and Dried on Tin Sheets
Charlie

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Charlie

21. Oktoba 2026DE
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Tannic Acid: Chinese Galls Extracted with Warm Water, Shaken with Ether and Dried on Tin Sheets

This is the large-scale way to make commercial tannin, as Thorpe's Dictionary (1913) gives it. Chinese galls from sumach hold as much as 70 % tannin; the best oak galls, from Aleppo, 50–60 %. The powder is extracted with warm water, and the extract is shaken with ether. After several days the ether layer on top is taken off; the tannin stays in the lower layer, which is dried on hot tin sheets until it puffs up. The product still holds some gallic acid, wax and glucose. Ether is very flammable: no flame. The picture: our diagram.
Kati
1 week

Maagizo

1

Extract the powdered galls with warm water

Powder Chinese galls finely. Stir with enough water at 50–60 °C to make a strong extract. Filter it clear.

Vifaa kwa hatua hii:

Galli za KichinaGalli za Kichina1 as required

Zana zinazohitajika:

MajiMaji
Kinu na mchi wa jiweKinu na mchi wa jiwe
KikorogoKikorogo
Bafu la MajiBafu la Maji
Kipimajoto cha maabaraKipimajoto cha maabara
Karatasi ya KuchujaKaratasi ya Kuchuja
Faneli ya Kioo Yenye BombaFaneli ya Kioo Yenye Bomba
2

Shake with a quarter volume of ether

Add ether, one quarter of the extract's volume, and agitate until it forms an emulsion. Let it stand for several days.

Zana zinazohitajika:

Dietili ethaDietili etha
Funeli ya KutenganishaFuneli ya Kutenganisha
Kabati la kutoa mvuke (lenye bomba)Kabati la kutoa mvuke (lenye bomba)
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
3

Take off the ether layer and recover the ether

Remove the upper ether layer. Run the lower layer, which holds all the tannin, into a still and distil off the ether in it to recover it. No flame near the ether.

Zana zinazohitajika:

Funeli ya KutenganishaFuneli ya Kutenganisha
Alembiki ya shabaAlembiki ya shaba
Kabati la kutoa mvuke (lenye bomba)Kabati la kutoa mvuke (lenye bomba)
4

Dry on tin sheets over a steam coil

Let the syrupy liquid cool, spread it on tin sheets and heat them with a steam coil. The tannin quickly puffs up and dries.

Zana zinazohitajika:

Bamba la batiBamba la bati
Koili ya mvukeKoili ya mvuke
Boila ya mvukeBoila ya mvuke
Glavu za mpiraGlavu za mpira

Vifaa

1

Zana Zinazohitajika

16

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Tannic Acid: Powdered Galls Extracted with Ether (Pelouze, Pharmacopoeia Form)

Tannic Acid: Powdered Galls Extracted with Ether (Pelouze, Pharmacopoeia Form)

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