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Updated: June 25, 2025
And something of Kin to this change of Colour in Vegetables is that, which Chymists are wont to observe upon the pouring of Acid Spirits upon the Red Solution of Sulphur, dissolv'd in an Infusion of Pot-ashes, or in some other sharp Lixivium, the Præcipitated Sulphur before it subsides, immediately turning the Red Liquor into a White one.
When a tingeing decoction is precipitated by an alkaline lixivium, and the precipitate is not redissolved by any acid, for the most part neither one nor the other of these saline substances ought to be used, but the neutral salts will be greatly preferable.
If the precipitate by the pure acid dissolve in an alkaline lixivium entirely, and with a colour, they may be considered as resino- mucilaginous particles, in which the tingeing property of the body must be looked for, which, in its natural state, subsists in an alkalino-saponaceous compound.
Indeed, in the summer time, I have found wonderful benefit in bathing my head with a decoction of some hot and aromatical herbs, in a lixivium made of the ashes of vine branches; and when my head is well washed with this, I immediately cause abundance of cold fountain water to be poured upon me stillatim, for a good half-hour together; which for the present is not only one of the most voluptuous and grateful refreshments imaginable, but an incredible benefit to me the whole year after: for I never need other powdering to my hair, to preserve it bright and clean, as the gallants do; but which does certainly greatly prejudice transpiration by filling up, or lying heavy upon the pores.
Or instead of these leaves, they may be dressed every day with a plaster of simple diachylon, or of gum ammoniacum softened in vinegar. The bark of the willow tree burnt to ashes, and mixed with strong vinegar, forms a lixivium which by repeated applications eradicates, warts, corns, and other cutaneous excrescences. It is however the wisest way to obviate the cause which produces them.
The mixture of alum with a tingeing decoction shows by the coloured precipitate that ensues from it, on the one hand, the colour it yields, and on the other hand, by the precipitate dissolving either partly or entirely in a strong alkaline lixivium, whether or not some of the earth of alum has been precipitated together with the colouring particles.
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