The seventh Experiment, of whitening Wax ([146].)
The eighth Experiment, with Tin-glass, and Sublimate ([147], [148].)
The ninth Experiment, of a Black powder of Gold in the bottom of Aqua-fortis, and of the Blacking of Refin'd Gold and Silver ([148], [149].)
The tenth Experiment, of the staining Hair, Skin, Ivory, &c. Black, with Crystals of Silver ([150], [151].)
The eleventh Experiment, about the Blackness of the Skin, and Hair of Negroes, and Inhabitants of Hot Climates. Several Objections are made, and the whole Matter more fully discours'd and stated from several notable Histories and Observations (from the [151] to the [167].)
The twelfth Experiment, of the white Powders, afforded by Precipitating several Bodies, as Crabs Eyes, Minium, Coral, Silver, Lead, Tin, Quick-silver, Tin-glass, Antimony, Benzoin, and Resinous Gumms out of Spirit of Wine, &c. but this is not Universal, since other Bodies, as Gold, Antimony, Quick-silver, &c. may be Precipitated of other Colours ([168], [169], [170].)
The thirteenth Experiment, of Changing the Blackness of some Bodies into other Colours ([171], [172].) and of Whitening what would be Minium, and Copper, with Tin, and of Copper with Arsnick, which with Coppilling again Vanishes; of covering the Colour of that of 1/3 of Gold with 2/3 of Silver melted in a Mass together ([173], [174])
The fourteenth Experiment, of turning the black Body of Horn into a White immediately with Scraping, without changing the Substantial form, or without the Intervention of Salt, Sulphur, or Mercury ([176].)
The fifteenth Experiment, contains several Instances against the Opinion of the Chymists that Sulphur Adust is the cause of Blackness, and the whole Matter is fully discuss'd and stated (from [176] to [184])