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Updated: May 24, 2025
Then it must be left to settle, which it will do in eight or ten hours. After which the water must be gently drawn out of the battery through plug-holes contrived for that purpose, so that the faeculae may remain at the bottom of the vat.
When the water has been violently agitated for fifteen or twenty minutes in the battery, by taking a little of the liquor up in a plate it will appear full of small grain or curdled; then you are to let in a quantity of lime-water kept in a vat for the purpose, to augment and precipitate the faeculae, still continuing to stir and beat vehemently the indigo water, till it becomes of a strong purple colour, and the grain hardly perceptible.
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