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Tannic Acid: Powdered Galls Extracted with Ether and Alcohol (75:25)
Charlie

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Charlie

21. uMfumfu 2026DE
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Tannic Acid: Powdered Galls Extracted with Ether and Alcohol (75:25)

Pelouze's way of getting tannic acid from galls uses ether; Thorpe's Dictionary (1913) notes that a mixture of 75 % ether and 25 % alcohol can be used in its place. The extract separates into two layers, and the lower one, a strong tannic acid solution, dries to a porous mass. No amounts are given. Ether is very flammable: no flame, fume hood. The picture: our diagram.
Ophakathi
1 day

Imiyalelo

1

Powder the galls

Grind oak galls finely. Ours: a mortar.

Izinto zokwakha zalesi sinyathelo:

Ama-gall omuthi wom-oakAma-gall omuthi wom-oak1 as required

Amathuluzi adingekayo:

Isigqulo Nomgqulo WetsheIsigqulo Nomgqulo Wetshe
2

Extract with 75 % ether, 25 % alcohol

Mix 75 parts commercial ether with 25 parts alcohol and extract the powder with it. Ours: shake in a stoppered bottle in a fume hood, away from any flame.

Amathuluzi adingekayo:

I-diethyl etherI-diethyl ether
I-ethanol - izinga lelabhorethri, 95 %I-ethanol - izinga lelabhorethri, 95 %
Isilinda esinezilinganisoIsilinda esinezilinganiso
Amabhodlela engilazi anezivimboAmabhodlela engilazi anezivimbo
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
3

Keep the lower layer and evaporate it

The extract separates into two layers: gallic acid, wax and resins in the upper, a strong tannic acid solution in the lower. Evaporate the lower layer to a porous mass. Ours: separatory funnel, evaporating dish on a water bath.

Amathuluzi adingekayo:

Isitheleli SokuhlukanisaIsitheleli Sokuhlukanisa
Ipuleti LokuhwamukaIpuleti Lokuhwamuka
Ibhavu LamanziIbhavu Lamanzi
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)

Izinto

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Amathuluzi Adingekayo

11

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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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