[23] Libr. 2do Cap. 34.
_EXPERIMENT XLVI._
We have often taken notice, as of a remarkable thing, that Metalls as they
appear to the Eye, before they come to be farther alter'd by other Bodyes,
do exhibit Colours very different from those which the Fire and the
_Menstruum_, either apart, or both together, do produce in them; especially
considering that these Metalline Bodyes are after all these disguises
reducible not only to their former Metalline Consistence and other more
radical properties, but to their Colour too, as if Nature had given divers
Metalls to each of them a double Colour, an _External_, and an _Internal_;
But though upon a more attentive Consideration of this difference of
Colours, it seem'd probable to me, that divers (for I say not all) of those
Colours which we have just now call'd _Internal_, are rather produc'd by
the Coalition of Metalline Particles with those of the Salts, or other
Bodyes employ'd to work on them, than by the bare alteration of the parts
of the Metalls themselves: and though therefore we may call the obvious
Colours, Natural or Common, & the others Adventitious, yet because such
changes of Colours, from whatsoever cause they be resolv'd to proceed may
be properly enough taken in to illustrate our present Subject, we shall not
scruple to take notice of some of them, especially because there are among
them such as are produc'd without the intervention of Saline _Menstruums_.
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