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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.
中级
1 week
说明
1
1
Extract the powdered galls with warm water
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.
此步骤所需材料：
中国五倍子1 as required所需工具：
水
石制研钵与研杵
搅拌器
水浴
实验室温度计
滤纸
带颈玻璃漏斗2
2
Shake with a quarter volume of ether
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.
所需工具：
乙醚
带活塞的分液漏斗
通风柜（带排风管）
化学防溅护目镜
橡胶手套3
3
Take off the ether layer and recover the ether
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.
所需工具：
带活塞的分液漏斗
铜蒸馏器通风柜（带排风管）4
4
Dry on tin sheets over a steam coil
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.
所需工具：
马口铁板
蒸汽盘管
蒸汽锅炉橡胶手套此蓝图制作
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