The second way whereby bodies become black, is an Atramentous condition or mixture, that is a vitriolate or copperose quality conjoyning with a terrestrious and astringent humidity; for so is _Atramentum Scriptorium_, or writing Ink commonly made by copperose cast upon a decoction or infusion of galls. I say a vitriolous or copperous quality; for vitriol is the active or chief ingredient in Ink, and no other salt that I know will strike the colour with galls; neither Alom, Sal-gem, Nitre, nor Armoniack. [SN: _What the common Copperose is._] Now artificial copperose, and such as we commonly use, is a rough and acrimonious kind of salt drawn out of ferreous and eruginous earths, partaking chiefly of Iron and Copper; the blew of Copper, the green most of Iron: Nor is it unusual to dissolve fragments of Iron in the liquor thereof, for advantage in the concretion. I say, a terrestrious or astringent humidity; for without this there will ensue no tincture; for Copperose in a decoction of Lettuce or Mallows affords no black, which with an astringent mixture it will do, though it be made up with oyl, as in printing and painting Ink. But whereas in this composition we use only Nut-gals, that is an excrescence from the Oak, therein we follow and beat upon the old receit; for any plant of austere and stiptick parts will suffice, as I have experimented in _Bistorte_, _Myrobolans_, _Myrtus Brabantica_, _Balaustium_ and Red Roses. And indeed, most decoctions of astringent plants, of what colour soever, do leave in the Liquor a deep and Muscadine red: which by addition of vitriol descends into a black: and so _Dioscorides_ in his receit of Ink, leaves out gall, and with copperose makes use of soot. Now if we enquire in what part of vitriol this Atramental and denigrating condition lodgeth, it will seem especially to lie in the more fixed salt thereof; for the phlegm or aqueous evaporation will not denigrate; nor yet spirits of vitriol, which carry with them volatile and nimbler Salt: For if upon a decoction of Copperose and gall, be poured the spirits or oyl of vitriol, the liquor will relinquish his blackness; the gall and parts of the copperose precipitate unto the bottom, and the Ink grow clear again; which it will not so easily do in common Ink, because that gum is dissolved therein which hindereth the separation. But Colcothar or vitriol burnt, though unto a redness containing the fixed salt, will make good Ink; and so will the Lixivium, or Lye made thereof with warm water; but the Terra or Insipid earth remaining, affords no black at all, but serves in many things for a gross and useful red. And though Spirits of vitriol, projected upon a decoction of gals, will not raise a black, yet if these spirits be any way fixed, or return into vitriol again, the same will act their former parts and denigrate as before.