ous_ 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
less into smaller, and consequently cannot be _diluted_; It is necessary
that they which are to imitate all kinds of colours, should have as many
degrees of each colour as can be procur'd.

And to this purpose, both Limners and Painters have a very great variety
both of Yellows and Blues, besides several other colour'd bodies that
exhibit very compounded colours, such as Greens and Purples; and others
that are compounded of several degrees of Yellow, or several degrees of
Blue, sometimes unmixt, and sometimes compounded with several other
colour'd bodies.

The Yellows, from the palest to the deepest Red or Scarlet, which has no
intermixture of Blue, are _pale and deep Masticut, Orpament, English Oker,
brown Oker, Red Lead, and Vermilion, burnt English Oker, and burnt brown
Oker,_ which last have