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And to shew you, Pyrophilus, that these Effects do not flow from the Oyl of Vitriol, as it is such, but as it is a strongly Acid Menstruum, that has the property both to Præcipitate Lead, as well as some other Concretes out of Spirit of Vinegar, and to heighten the Colour of Red Rose-leaves, I add, that I have done the same thing, though perhaps not quite so well with Spirit of Salt, and that I could not do it with Aqua-fortis, because though that potent Menstruum does as well as the others heighthen the Redness of Roses, yet it would not like them Precipitate Lead out of Spirit of Vinegar, but would rather have dissolv'd it, if it had not found it dissolv'd already.
STAINING OF PARCHMENT. Paper or parchment may be stained of a green colour, by gradually dissolving some copper filings in aqua-fortis, or the spirits of salt, putting in the filings till the ebullition ceases. A solution of verdigris in vinegar, or the crystals of verdigris in water, will answer the same purpose.
If the honesty of these goldcleaners can be depended upon their dexterity is almost infallible; and as some check upon the former it is usual to pour the contents of each parcel when thus cleansed into a vessel of aqua-fortis, which puts their accuracy to the test. The parcels or bulses in which the gold is packed up are formed of the integument that covers the heart of the buffalo.
As she did so a few drops of the liquid fell upon her breast, and instantly burned her skin like live coals; indeed, this infernal draught was composed of arsenic and sublimate infused in aqua-fortis; then, thinking that no more would be required of her, she dropped the glass.
And very merry and good discourse about the business we have been upon, and after dinner went to the Assay Office and there saw the manner of assaying of gold and silver, and how silver melted down with gold do part, just being put into aqua-fortis, the silver turning into water, and the gold lying whole in the very form it was put in, mixed of gold and silver, which is a miracle; and to see no silver at all but turned into water, which they can bring again into itself out of the water.
But a better Instance may be taken from Copper, for I have try'd, that if upon a Copper-plate you let some Drops of weak Aqua-fortis rest for a while, the Corpuscles of the Menstruum, joyning with those of the Metall, will produce a very sensible Asperity upon the Surface of the Plate, and will Concoagulate that way into very minute Grains of a Pale Blew Vitriol; whereas if upon another part of the same Plate you suffer a little strong Spirit of Urine to rest a competent time, you shall find the Asperated Surface adorn'd with a Deeper and Richer Blew.
The old lady went to the seaside in despair, and during her absence he completely effaced the name from her brass door-plate, in his attempts to polish it with aqua-fortis. But all this is nothing to his seditious conduct in public life.
Having then observ'd, that Mercury being dissolv'd in Some Menstruums, would yield a dark Yellow Precipitate, and supposing that, as to this, common Water, and the Salts that stick to the Mercury would be equivalent to those Acid Menstruums, which work upon the Quick-silver, upon the account of their Saline particles, I substituted a Solution of Sublimate in fair Water, instead of a Solution of Mercury in Aqua-fortis, or Spirit of Nitre, that simple Solution being both clearer and free from that very offensive Smell, which accompanies the Solutions of Mercury made with those other corrosive Liquors; then I consider'd, that That, which makes the Yellow Colour, is indeed but a Precipitate made by the means of the Oyl of Tartar, which we drop in, and which, as Chymists know, does generally precipitate Metalline Bodies corroded by Acid Salts; so that the Colour in our case results from the Coalition of the Mercurial particles with the Saline ones, wherewith they were formerly associated, and with the Alcalizate particles of the Salt of Tartar that swim up and down in the Oyl.
And the same Aqua-fortis, that will quickly change the Redness of Red Lead into a Darker Colour, will, being put upon Crude Lead, produce a Whitish Substance, as with Copper it did a Blewish.
And I will undertake that, with a little more pains and considerations, out of the very same words, he could have taught the people how to make custards, or marmalade, or to stew prunes! But, pray, why "the aqua-fortis of tears?" For if it so falls out that there should chance to be neither Apothecary, nor Druggist at church, there is an excellent jest wholly lost!
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