Experiments and considerations touching colours first occasionally written, among some other essays to a friend, and now suffer'd to come abroad as the beginning of an experimental history of colours / by the Honourable Robert Boyle ...

Part the Third. Concerning Fromiscuous Experiments about Colours.

Experiment the First. IN confirmation of a former Conjecture about the Generation of Colours from diversity of Reflections are set down several Observations made in a darkned Room (186, 187.)

Experiment the second, That white Linnen seem'd Ting'd with the Red of Silk plac'd near it in a light Room (188, 189.)

Experiment the third, Of the Trajection of Light through Colour'd Papers (189, 190.)

Experiment the fourth, Observations of a Prism in a dark Room (191, 192.)

Experiment the fifth, Of the Refracting and Reflecting Prismatical Colours in a light Room (193.)

Experiment the sixth, Of the Vanishing of the Iris of the Prism, upon the access of a greater ad∣ventitious Light (194.)

Experiment the seventh, Of the appearances of the same Colour'd Papers by Candle-light (195, 196.)

Experiment the eighth, Of the Yellowness of the Flame of a Candle (197.)

Experiment the ninth, Of the Greenish Blew transparency of Leaf Gold (198.)

Experiment the tenth, Of the curious Tin∣ctures afforded by Lignum Nephriticum (from 199 to 203.) Several trials for the Investiga∣tion of the Nature of it (from 204 to 206.) Kircher's relation of this Wood set down, and examin'd (from 206 to 212.) A Corollary on this tenth Experiment, shewing how it may be applicable for the Discovering, whether any Salt be of an Acid, or a Sulphureous, and Alcalizate Nature (from 213 to 216.)

The eleventh Experiment, Of certain pieces of Glass that afforded this Variety of Colours; And of the way of so Tinging any Plate of Glass with Silver (from 216 to 219.)

The twelfth Experiment, Of the Mixing and Tempering of Painters Pigments (219, 220, 221.)

The thirteenth Experiment, Of compounding several Colours by Trajecting the Sun-beams through Ting'd Glasses (from 221 to 224.)

The fourteenth Experiment, Of the Compound∣ing of Real and Phantastical Colours, and the Re∣sults (224, 225, 226.) as also the same of Phantastical Colours (226, 227.)

The fifteenth Experiment, Of Varying the Trajected Iris by a Colour'd Prism (228, 229.)

The sixteenth Experiment, Of the Red fumes of Spirit of Nitre, and the resembling Redness of the Horizontal Sun-beams (230, 231.)

The seventeenth Experiment, Of making a Green by nine Kinds of Compositions (from 231 to 236.) And some Deductions from them against the necessity of recurring to Substantial forms and Hypostatical principles for the production of Co∣lours (from 237 to 240.)

The eighteenth Experiment, Of several Compo∣sitions of Blew and Yellow which produce not a Green, and of the production of a Green by other Colours (241, 242.)

The nineteenth Experiment, contains several In∣stances of producing Colours, without the alte∣ration of any Hypostatical principle, by the Prism, Bubbles, and Feathers (from 242 to 245.)

The twentieth Experiment, Of turning the Blew of Violets into a Red by Acid Salts, and to a Green by Alcalizate (245, 246.) and the use

of it for Investigating the Nature of Salts (247, 248.)

The one and twentieth Experiment, of the same Changes effected by the same means on the Blew Tinctures of Corn-flowers (249, 250.) And some Restrictions to shew it not to be so general a propriety as one might imagine (251.)

The twenty second Experiment, of turning a Solution of Verdigrease into a Blew, with Alca∣lizate and Urinous Salts (252, 253, 254.)

The twenty third Experiment, of taking away the Colour of Roses with the Steams of Sulphur, and heightning them with the Steams Condens'd into Oyl of Sulphur per Campanam (254, 255.)

The twenty fourth Experiment, of Tinging a great quantity of Liquor with a very little Ting'd Substance, Instanced in Cochineel (from 255 to 257.)

The twenty fifth Experiment, of the more ge∣neral use of Alcalizate and Sulphureous Salts in the Tinctures of Vegetables, further Instanced in the Tincture of Privet Berries, and of the Flowers of Mesereon and Pease (from 257 to 259.) An Annotation, shewing that of the three Hypostatical principles, Salt according to Pa∣racelsus is the most, active about Colours (from 259 to 261.) Some things Praecursory premis'd

to three several Instances next following, against the fore-mention'd Operations of Salts (261, 262.)

The twenty sixth Experiment, containing Trials with Acid and Sulphureous Salts on the Red Tinctures of Clove-july-flowers, Buck thorn Berries, Red-Roses, Brasil, &c. (262, 263.)

The twenty seventh Experiment, of the chan∣ges of the Colour of Jasmin flowers, and Snow drops, by Alcalizate and Sulphureous Salts (263, 264.)

The twenty eighth Experiment, of other differ∣ing Effects on Mary-golds, Prim-roses, and fresh Madder (265.) with an Admonition, that these Salts may have differing Effects in the changing of the Tinctures of divers other Vegetables (266, 267.)

The twenty ninth Experiment, of the differing Effects of these Salts on Ripe and Unripe Juices, instanced in Black-berries, and the Juices of Roses (from 267 to 270.) Two reasons, why the Au∣thor added this twenty ninth Experiment, the last of which is confirm'd by an Instance of Mr. Par∣kinson, consonant to the Confession of the Makers of such Colours (272.)

The thirtieth Experiment, of several changes in Colours by Digestion, exemplify'd by an Amal∣gam of ☉ and ☿ and by Spirit of Harts-horn. And (to such as believe it) by the changes of the Elixir.

The thirty first Experiment, shewing that most Tinctures drawn by Digestion incline to a Red, instanc'd in Jalap, Guaicum, Amber, Benzoin, Sulphur, Antimony, &c. (276, 277.)

The thirty second Experiment, That some Reds with Diluting turn Yellow, others not, exemplify'd by the Tincture of Cochineel, and by Balsam of Sulphur, Tinctures of Amber, &c. (277, 278, 279.)

The thirty third Experiment, of a Red Tin∣cture of Saccarum ♄ and Oyl of Turpentine made by Digestion (279.)

The thirty fourth Experiment, of drawing a Volatile red Tincture of Mercury, whose Steams were white, but it would Tinge the Skin black (279, 280.)

The thirty fifth Experiment, of a suddain way of making a Blood red Colour with Oyl of Vitriol, and Oyl of Anniseeds, two transparent Liquors (280, 281.)

The thirty sixth Experiment, of the Degene∣rating of several Colours exemplify'd in the last mention'd Blood red, and by Mr. Parkinsons relation of Turnsol, by some Trials with the Juice of Buck-thorn Berries, and other Vegeta∣bles, to which several notable Considerations and Advertisements back'd with Experiments are ad∣joyn'd (from 281 to 288.)

The thirty seventh Experiment, Of Varying the Colour of the Tinctures of Cochineel, Red∣cherries, and Brasil, with Acid and Sulphureous Salts, and divers Considerations thereon (from 288 to 290.)

The thirty eighth Experiment, About the Red fumes of some, and White of other distill'd Bodies, and of their Coalition for the most part into a transparent Liquor (290, 291.) And of the various Colours of dry Sublimations, ex∣emplify'd with several Experiments (292, 293, 294.)

The thirty ninth Experiment, Of Varying the Decoction of Balaustiums with Acid and Urinous Salts (294, 295.) Some Annota∣tions wherein two Experiments of Gassendus are Related, Examined, and Improv'd (from 295 to 302.)

The fortieth Experiment, Of the no less Strange than Pleasant changes made with a So∣lution of Sublimate (from 302 to 306.) The difference between a Chymical and Philosophical Solution of a Phaenomenon (307, 308.) The Authors Chymical Explication of the Phaeno∣mena, confirm'd by several Experiments made on Mercury, with several Saline Liquors (from 308 to 310.) An Improvement of the fortieth Experiment, by a fresh Decoction of Antimony in a Lixivium (311, 312, 313.) Reflections on the tenth, twentieth, and fortieth Experiments, compar'd together, shewing away with this Tin∣cture

of Sublimate to distinguish whether any Sa∣line Body to be examin'd be of a Urinous or Alca∣lizate Nature (from 314 to 317.) The Ex∣amination of Spirit of Sal-armoniack, and Spirit of Oak by these Principles (from 316 to 319.) That the Author knows ways of making highly Operative Saline Bodies, that produce none of the before mention'd Effects (319, 320.) Some notable Experiments about Solutions and Precipi∣tations of Gold and Silver (320, 321.)

The one and fortieth Experiment, Of Depri∣ving a deep Blew Solution of Copper of its Colour (322.) to which is adjoyn'd the Discolouring or making Transparent a Solution of Verdigrease, &c. and another of Restoring or Increasing it (322, 323.)

The forty second Experiment, Of changing a Milk white Precipitate of Mercury into a Yel∣low, by Affusion of fair Water, with several Considerations thereon (from 323 to 326.)

The forty third Experiment, Of Extracting a Green Solution with fair Water out of imperfectly Calcin'd Vitriol (327.)

The forty fourth Experiment, Of the Deep∣ning and Diluting of several Tinctures, by the Affusions of Liquors, and by Conical Glasses that contain'd them, Exemplify'd in the Tinctures of Cochineel, Brasil, Verdigrease, Glass, Litmus, of which last on this occasion se∣veral pleasant Phaenomena are related (from

328 to 335.) To which are adjoyn'd certain Cautional Corollaries (335, 336.) The Water-drinker and some of his Legerdemain tricks re∣lated (337.)

The forty fifth Experiment, Of the turning Rhenish and White Wine into a lovely Green, with a preparation of Steel (338, 339. Some further Trial made about these Tinctures, and a Similar Experiment of Olaus VVormius (340.)

The forty sixth Experiment, Of the Internal Colour of Metalls exhibittd by Calcination (341, 342, 343.) Annotation the first, That several degrees of Fire may disclose a differ∣ing Colour (343.) Annotation the second, That the Glasses of Metalls may exhibit also other Kinds of Colours (344.) Annotation the third, That Minerals by several degrees of Fire may disclose several Colours (345.)

Experiment the forty seventh, Of the Inter∣nal Colours of Metalls disclos'd by their Dissolu∣tions in several Menstruums (from 345 to 350.) Annotation the first, The Authors Apology for Recording some already known Experiments, without mentioning their Authors (from 350 to 352. Annotation the second, That some Mi∣nerals also by Dissolutions in Menstruums may exhibit divers Colours (353.) Annotation the third, That Metalls disclose other Colours by Precipitations, instanc'd in Mercury (from 353 to 355.)

The forty eighth Experiment, Of Tinging Glass Blew with Leaf Silver, and with Calcin'd Copper, and White with Putty (from 355 to 358.) Annotation the first, That this white Glass is the Basis of Ammels (358.) Anno∣tion the second, That Colour'd Glasses may be Compounded like Colour'd Liquors in Dying Fats (359.) Annotation the third, Of Tinging Glass with Mineral Substances, and of trying what Metalls they contain by this means (from 360 to 362.) Annotation the fourth, That Metalls may be Ting'd by Mineralls (362, 363.) Annotation the fifth, Of making several Kinds of Amauses or Counterfeit Stones (from 363 to 365.) Annotation the sixth, Of the Scarlet Dye, of the Stains of dissolv'd Gold and Silver (366, 367.) Of the Greenness of Salt Beef, and Redness of Neats Tongues from Salts; of Gilding Silver with Bathe Water (368, 369.) And Tinging the Nails and Skin with Alcanna (369)

The forty ninth Experiment, Of making Lakes (369.) A particular example in Tur∣merick (370, 371.) Annotation the first, That in Precipitations wherein Allum is a Co∣efficient, a great part of them may consist of the Stony particles of that Compound Body (from 372 to 375.) Annotation the second, That Lakes may be made of other Substances, as Madder, Rue, &c. but that Alcalizate Salts do not always Extract the same Colour of which the Vegetable appears (from 376 to 378.) Annotation the third, That the Experiments

related may Hint divers others (378.) An∣notation the fourth, That Alum is usefull for the preparing other than Vegetable Pigments (379.)

The fiftieth Experiment, Of the Similar effects of Saccarum ♄ and Alkalies, of Precipitating with Oyl of Vitriol out of Aqua-fortis, and Spirit of Vinegar; and of divers Varyings of the Colours, with these Compounded (from 380 to 384.) Ano∣ther very pretty Experiment, with a Solution of Minium (384, 385.) That these Experiments Skilfully digested may hint divers matters about Colours (386.) The Authors Apologetick con∣clusion, in which is Cursorily hinted the Bow or Scarlet Dye (387.) The Authors Letter to Sir Robert Moray, concerning his Observations on the Shining Diamond (391. &c.) And the Ob∣servations themselves.