And indeed, there seem to be so few bodies in the world that are _in
minimis_ opacous, that I think one may make it a rational _Query_, Whether
there be any body absolutely thus _opacous_? For I doubt not at all (and I
have taken notice of very many circumstances that make me of this mind)
that could we very much improve the _Microscope_, we might be able to see
all those bodies very plainly transparent, which we now are fain onely to
ghess at by circumstances. Nay, the Object Glasses we yet make use of are
such, that they make many transparent bodies to the eye, seem _opacous_
through them, which if we widen the Aperture a little, and cast more light
on the objects, and not charge the Glasses so deep, will again disclose
their transparency.

Now, as for all kinds of colours that are dissolvable in Water, or other
liquors, there is nothing so manifest, as that all those ting'd liquors are
transparent; and many of them are capable of being _diluted_ and compounded
or mixt with other colours, and divers of them are capable of being very
much chang'd and heightned, and fixt with several kinds of _Saline
menstruums_. Others of them upon compounding, destroy or vitiate each
others colours, and _precipitate_, or otherwise very much alter each others
tincture. In the true ordering and _diluting_, and deepning, and mixing,
and fixing of each of which, consists one of the greatest mysteries of the
Dyers; of which particulars, because our _Microscope_ affords us very
little information, I shall add nothing more at present; but onely that
with a very few tinctures order'd and mixt after certain ways, too long to
be here set down, I have been able to make an appearance of all the various
colours imaginable, without at all using the help of _Salts_, or _Saline
menstruums_ to vary them.

As for the mutation of Colours by _Saline menstruums_, they have already
been so fully and excellently handled by the lately mention'd Incomparable