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Tannate of Iron
Dissolve 1 part of tannin in 150 of boiling water; add 9 dryness. parts hydrated sesquioxide of iron, freshly 4181. Carbonate of Potassa. This is precipitated, washed, and dried in the water- also known under the name Salt of Tartar, bath; evaporate gently to one half; filter, and Salt of Wormwood. The crude carbonate then add 1 part sugar, evaporate to dryness, is obtained by lixiviating (see No. 23) wood and keep in a close vessel. Or: 1 part sesquioxide of iron and 2 of tannic acid evaporated to dryness with 3 parts alcohol.