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A28968 Experimenta & observationes physicæ wherein are briefly treated of several subjects relating to natural philosophy in an experimental way : to which is added, a small collection of strange reports / by the Honourable Robert Boyle ... Boyle, Robert, 1627-1691. 1691 (1691) Wing B3959; ESTC R19615 59,707 217

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while will let fall a precipitate of the same Colour XIII And if instead of a Solution of Silver or Quick-silver you take a Red Solution or Tincture of Benjamin or of the Resinous part of Jallap Root or you 'le also have upon the Affusion of Spirit of Salt a white Liquor and a Precipitate of the same Colour XIV Being desirous to produce two differingColours at once by the same Affusion of Spirit of Salt I infused some dryed red Rose leaves in fair Water till it had acquired a deep Colour from them To this Infusion pour'd off warily that it might be clear I added a considerable proportion of the sweet Liquor made by digesting Spirit of Vinegar upon red Lead by which I knew 't would be turn'd of a Blewish Green Upon this almost opacous Liquor I pour'd Spirit of Salt which as I expected precipitated the Lead that had been dissolv'd in the sweet Liquor into a very white Powder and gave the remaining Liquor well impregnated with particles of the Rose Leaves a very fine and durable Scarlet Colour To which Experiment I shall add on this occasion that if it had been well made you may barely by shaking very well together and confounding the White Powder with the Red Liquor make a Carnation Colour which when 't is made as it should be appear'd very fine and lovely whilst it lasted for in no long time the two Substances that compos'd it would by degrees separate and re-appear each of them in its former place and Colour XV. We took some Spirit of Salt that having lain long upon Fylings of Copper had lost the muddy Tincture it had first acquired by being almost boil'd upon them This Liquor I say that look'd like common Water we pour'd into a small but wide-mouth'd Christal-Glass about half an hour after 8 in the Morning and leaving it in a Window it appear'd after 40 Minutes to have there acquir'd a Colour much like that of a German Amethist and seem'd to have no tendency to Greenness But being detain'd by the visit of a Virtuoso till eleven a Clock I could not see what happen'd in the mean time But then as he was going away I invited him to see the Liquor which he not knowing what it was told me it look'd of a Grass-green Colour wherein tho I were not altogether of his mind yet in a short time after it did to me also appear of a lovely Green in its passage to which it had in all been expos'd about 3 hours and a half XVI Precipitate a strong Solution of Sublimate made in fair Water with a s q. and no more of Oyl of Tartar per deliquium Put the Liquor and Powder into a Filter of Cap-paper and when the Water is run thorow there will remain in the Filter the Precipitate which is to be slowly and well dry'd Then take it out of the Filter in the form of a gross Powder and having put it into a clear Glass let fall on it warily some Drops of pretty strong Spirit of Salt and if the Experiment succeeds with you as it did with me during the Conflict that will be made the little Lumps of the Precipitate will lose all their former Brick-dust Colour and turn White tho afterwards they will appear dissolv'd into a transparent Liquor wherein the Orange Colour is quite abolish'd XVII Having calcin'd Copper without any Additament save Fire and Water by the way we elsewhere mention we took an Arbitrary quantity of it and having pour'd on it about 3 or 4 times the quantity of good Spirit of Salt we obtain'd what we look'd for both a Muddy but manifestly Reddish Liquor and somewhat to the surprize of the Persons I had a mind to satisfy a white Powder whose quantity bore a considerable proportion to the Part that was dissolv'd but whose Qualities belong not to this place In which part its self to add that upon the by by the affusion of common Water and the action of the Air we afterwards produc'd more than one change of Colour XVIII We sometimes for Curiosity sake took a quantity not exceeding a spoonful of the dark brown or somewhat reddish Solution of ♀ mention'd in the foregoing Experiment and having put it into a cylindrical Vial that the change of Colour may appear the better we pour'd on it 2 or 3 Spoonfuls of totally ardent vinous Spirit and giving the Glass a shake to mingle them we presently had as soon as the mixture became clear a lovely green Liquor which when 't was well setled was very fair and lookt almost as if it were a liquid Emerald XIX We took some green Taffatee Ribband and having moisten'd one part of it that was not great twice or thrice with good Spirit of Salt we suffer'd it to dry of its self which it did in a short time and then we found as we expected that the wetted part was no longer of a Green but chang'd to a Blew Colour But the same Spirit to add that upon the by presently turn'd that part of a piece of black Ribband upon which we put 2 or 3 Drops of it to a Colour not unlike that which they call Fueille Morte or a fading Leaf XX. 'T is usual in Paper-shops and in divers other places to meet with Pamphlets and other thin Books that are covered with Papers that look sometimes of a Greenish Blew Colour bordering upon Purple and sometimes upon that of Violets Some of the deeper colour'd Papers of this sort I have several times to gratify some curious Persons especially of the Sex held in my left hand and with the other lightly and nimbly toucht them here and there with the end of a feather cut off from the rest of the Quill dipt in Spirit of Salt which almost in the twinkling of an Eye dy'd the toucht parts of the Paper with a Lovely Red that would sometimes continue very Vivid for a good while and be manifest at the end of divers Weeks if not Months And if instead of the forementioned Quil I took into my right hand a Brush or somewhat that was fit to sprinkle with and having dipt it in the Saline Spirit made many drops at once fall upon the Paper 't was pleasant enough to behold how suddenly and prettily it would be Speckled XXI VVe took Antimony well powder'd and pour'd on it 3 or 4 times its weight of good Spirit of Salt we caus'd it to be boil'd in this Liquor and that in a Glass Vessel wherein a part of it was dissolv'd and taken up into the Menstruum where the Antimony quite lost its blackness And this thus impregnated Spirit of Salt being dropt into fair VVater the black Mineral subsided immediately in the form of a very white Powder or Precipitate To these I might add other changes of Colours that I have made by the help of Spirit of Salt But these being not of so quick and easy Tryal especially because some of them require skill in Chymistry I