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Tannic Acid: Galls Stirred to a Cream with Ether and Pressed (Leconnet)
Leconnet's method (Annalen, 1836), as Thorpe's Dictionary (1913) gives it: stir powdered galls into ether until a thin cream forms, press it, and repeat until no more tannin comes out. Thorpe does not say how the pressed liquid is worked up; evaporating it is ours. Ether is very flammable: no flame, fume hood.
The picture: our diagram.
中级
1 day
说明
1
1
Stir powdered galls into ether to a thin cream
Stir powdered galls into ether to a thin cream
Grind oak galls finely and stir the powder into ether until the mixture is a thin cream. Ours: a mortar, then a stirrer in a fume hood, no flame.
此步骤所需材料：
五倍子（栎瘿）1 as required所需工具：
乙醚
石制研钵与研杵
搅拌器
通风柜（带排风管）
化学防溅护目镜
橡胶手套2
2
Press, and repeat
Press, and repeat
Press the cream to drive out the liquid. Stir the pressed cake into fresh ether and press again; repeat until no more tannin is removed. Ours: a cloth screw press with filter cloth.
所需工具：
织物螺旋压机
细棉滤布乙醚通风柜（带排风管）3
3
Evaporate the pressed liquid (ours)
Evaporate the pressed liquid (ours)
Thorpe gives no work-up. Ours: evaporate the pressed liquid in a dish on a water bath, no flame, to leave the tannic acid.
所需工具：
蒸发皿
水浴通风柜（带排风管）此蓝图制作
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