two Ingredients of Arsenick, yet this last nam'd Body being duely added to
the highest Colour'd Metall Copper, when 'tis in fusion, gives it a
whiteness both within and without. Thus _Lapis Calaminaris_ changes and
improves the Colour of Copper by turning it into Brass. And I have
sometimes by the help of Zinck duely mix'd after a certain manner, given
Copper one of the Richest Golden Colours that ever I have seen the Best
true Gold Ennobled with. But pray have a care that such Hints fall not into
any hands that may mis-imploy them.

_Annotation V._

Upon the Knowledge of the differing wayes of making Minerals and Metalls
produce their adventitious Colours in Bodies capable of Vitrification,
depends the pretty Art of making what Chymists by a Barbarous Word are
pleas'd to call _Amanses_, that is counterfeit, or factitious Gemms, as
Emeralds, Rubies, Saphires, Topazes, and the like. For in the making of
these, though pure Sand or Calcin'd Crystal give the Body, yet 'tis for the
most part some Metalline or Mineral _Calx_, mingled in a small proportion
that gives the Colour. But though I have many years since taken delight, to
divert my self with this pleasing Art, and have seen very pretty
Productions of it, yet besides that I fear I have now forgot most of the
little Skill I had in it, this is no place to entertain you with what would
rather take up an intire Discourse, than be comprehended in an Annotation;
wherefore the few things which I shall here take notice of to you, are only
what belong to the present Argument, Namely,

First, That I have often observ'd that Calcin'd Lead Colliquated with fine
White Sand or Crystal, reduc'd by ignitions and subsequent extinctions in
Water to a subtile Powder, will of it self be brought by a due Decoction to
give a cleer Mass Colour'd like a _German_ Amethyst. For though this glass