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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.
To make white LEMON CREAM. Take a jill of spring water and a pound of fine sugar, set it over a fire till the sugar and water be dissolv'd, then put the juice of four good lemons to your sugar and water, the whites of four eggs well beat, set it on the fire again, and keep it stirring one way till it just simmers and does not boil, strain it thro' a fine cloth, then put it on the fire again, adding to it a spoonful of orange-flower water, stir it till it thickens on a slow fire, then strain into basons or glasses for your use; do not let it boil, if you do it will curdle.
Thus infenfibly the Crolians encreas'd their number. The Crolians being Men of vast Cash, they no sooner withdrew their Mony from the General Bank but the Bank languisht, Credit sunk, and in a short time they had little to do, but dissolv'd of Course.
On this occasion some verses were composed by a Sir J. M. containing these lines: But her chaste breast, cold as the cloyster'd nun, Whose frost to chrystal might congeal the sun, So glar'd the stream, that pilots, there afloat, Thought they might safely land without a boat; July had seen the Thames in ice involv'd, Had it not been by her own beams dissolv'd.
And to vary the Experiment a little, I try'd, that if into a Glass of Rhenish Wine made Green by this Essence, I dropp'd an Alcalizate Solution, or Urinous Spirit, the Wine would presently grow Turbid, and of an odd Dirty Colour; But if instead of dissolving the Essence in Wine, I dissolv'd it in fair Water sharpen'd perhaps with a little Spirit of Salt, then either the Urinous Spirit of Sal Armoniack, or the solution of the fix'd Salt of Pot-ashes would immediately turn it of a Yellowish Colour, the fix'd or Urinous Salt Precipitating the Vitriolate substance contain'd in the Essence.
And though you rubb Blew Vitriol, how Venereal and Unsophisticated soever it be, upon the Whetted Blade of a Knife, it will not impart to the Iron its Latent Colour, but if you moisten the Vitriol with your Spittle, or common Water, the Particles of the Liquor disjoyning those of the Vitriol, and thereby giving them the Various Agitation requisite to Fluid Bodies, the Metalline Corpuscles of the thus Dissolv'd Vitriol will Lodge themselves in Throngs in the Small and Congruous Pores of the Iron they are Rubb'd on, and so give the Surface of it the Genuine Colour of the Copper.
And I remember that the other day, I made my self some Sport by an Improvement of this Observation, for having dissolv'd some Pure Silver in Aqua Fortis, and Evaporated the Menstruum ad siccitatem, as they speak, I caus'd a Quantity of fair Water to be pour'd upon the Calx two or three several times, and to be at each Evaporated, till the Calx was very Drye, and all the Greenish Blewness that is wont to appear in Common Crystals of Silver, was quite carry'd away.
To every quart of gooseberries, take a quart of spring water, bruise them in a mortar, put the water to them and let them stand two or three days, then strain it off, and to every gallon of liquor put three pounds and a half of sugar, then put it into the barrel, and it will of itself rise to a froth, which take off, and keep the barrel full; when the froth is all work'd off, bung it up for six weeks, then rack it off, and when the lees are clean taken out, put the wine into the same barrel; and to every gallon put half a pound of sugar, made in syrrup, and when cold mix with wine; to every five gallons, have an ounce of isinglass, dissolv'd in a little of the wine, and put in with the syrrup, so bung it up; when fine, you may either bottle it or draw it out of the vessel.
And other Examples might be added of this way of producing Whiteness in Bodyes by Præcipitating them out of the Liquors wherein they have been Dissolv'd; but I think it may be more usefull to admonish you, Pyrophilus, that this observation admits of Restrictions, and is not so Universal, as by this time perhaps you have begun to think it; For though most Præcipitated Bodyes are White, yet I know some that are not; For Gold Dissolv'd in Aqua Regis, whether you Præcipitate it with Oyl of Tartar, or with Spirit of Sal Armoniack, will not afford a White but a Yellow Calx.
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.
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