you shall find that a small thickness of those Plates will constitute an
_opacous_ body, and that you may see through the mass of Glass before it be
thus _laminated_, above four times the thickness: And besides, they will
now afford a colour by reflection as other _opacous_ (as they are call'd)
colours will, but much fainter and whiter than that of the Lump or Pipe out
of which they were made.

Thus also, if you take _Putty_, and melt it with any transparent colour'd
Glass, it will make it become an _opacous_ colour'd lump, and to yield a
paler and whiter colour than the lump by reflection.

The same thing may be done by a preparation of _Antimony_, as has been
shewn by the Learned _Physician_, Dr. _C.M._ in his Excellent Observations
and Notes on _Nery's Art of Glass_; and by this means all transparent
colours become _opacous_, or _ammels_. And though by being ground they lose
very much of their colour, growing much whiter by reason of the multitude
of single reflections from their outward surface, as I shew'd afore, yet
the fire that in the nealing or melting re-unites them, and so renews those
_spurious_ reflections, removes also those whitenings of the colour that
proceed from them.

As for the other colours which Painters use, which are transparent, and
us'd to varnish over all other paintings, 'tis well enough known that the
laying on of them thinner or thicker, does very much _dilute_ or deepen
their colour.

Painters Colours therefore consisting most of them of solid particles, so
small that they cannot be either re-united into thicker particles by any
Art yet known, and consequently cannot be deepned; or divided into
particles so small as the flaw'd particles that exhibit that colour, much