iner Yellow than that which we have divers times this way
produc'd (which is the more considerable, because durable and pleasant
Yellows are very hard to be met with, as may appear by the great use which
Painters are for its Colours sake fain to make of that pernicious and heavy
Mineral, Orpiment) yet I fear our Yellow is too costly, to be like to be
imploy'd by Painters, unless about Choice pieces of Work, nor do I know how
well it will agree with every Pigment, especially, wich Oyl'd Colours. And
whether this Experiment, though it have seem'd somewhat strange to most we
have shown it to, be really of another Nature than those wherein Saline
Liquors are imploy'd, may, as we formerly also hinted, be so plausibly
doubted, that whether the Water pour'd on the _Calx_, do barely by imbibing
some of its Saline parts alter its Colour by altering its Texture, or
whether by dissolving the Concoagulated Salts, it does become a Saline
_Menstruum_, and, as such, work upon the Mercury, I freely leave to you
(_Pyrophilus_) to consider. And that I may give you some Assistance in your
Enquiry, I will not only tell you, that I have several times with fair
Water wash'd from this _Calx_, good store of strongly tasted Corpuscles,
which by the abstraction of the _Menstruum_, I could reduce into Salt; but
I will also subjoyn an Experiment, which I devis'd, to shew among other
things, how much a real and permanent Colour may be as it were drawn forth
by a Liquor that has neither Colour, nor so much as Saline or other Active
parts, provided it can but bring the parts of the Body it imbibes to
convene into clusters dispos'd after the manner requisite to the exhibiting
of the emergent Colour. The Experiment was this.

[22] _Beguinus_, Tyr. Chy. Lib. 2