MIcROGRAPHIA. 
Blues may be dil/uted,as Salt and Bife , and Adafticut,whichis Yellow,may 
be made more faint : And even Vermilion it felf may,by too much grind- 
ing, be brought to the colour of Red-/ead, which is but an Orange colour, 
which is confeft by all to be very much upon the Yellow. Now, though 
perhaps fomewhat of this diluting of Vermilion by overmuch grinding 
may be attributed to the Grindftone, or muller, for that fome of their 
parts may be worn off and mixt with the colour, yet there feems not ve- 
ry much, for I have done it on aSerpentine-{tone with a muller made ofa 
Pebble, and yet obferv'd the fame effect follow. | ak 
And fecondly, as to the other of thefe operations on colours; that 1s, 
the deepning of them, Limners and Painters colours are for the moft part 
alfo uncapable. For they being for the moft part opacous 5 and that opa- 
coufnef,, as {faid before, proceeding from the particles, being very much 
flaw'd, unlefs we were able to joyn and re-unite thofe flawd particles 
again into one piece, we fhall not be able to deepen the colour, which 
fince we are unable to do with moft of the colours which are by Painters 
accounted opacows, we are therefore unable to deepen them by adding 
more of the fame kind. i : Pobre 
But becaufe all thofe opacous colours have two kinds of beams or Rays — 
refleGted from them, that is,Rays unting'd,which are onely reflected from 
the outward furface, without at all penetrating of the body,and ting’d 
Rays which are reflected from the inward furfaces or flaws after they 
have fuffer’d a two-fold refraction 5 and becaufe that tranfparent liquors 
mixt with{uch corpufcles, do,for the moft part, take off the former kind 
of reflection; theretore thefe colours mixt with Water or Oyl, appear — 
much deeper than when dry,for moft part of that white reflection from the _ 
outward furface is remov’d. Nay, fome of thefe colours are very much 
dcepned by the mixture with fome tranfparent liquor, and that becaufe _ 
they may perhaps get between thofe ewolawes and fo confequently joyn 
two — of thofe flaw’d pieces together but this happens but ina 
very few. : Ibo 5. it oni 39 
Now, to fhew that all this is not gratis dium, I fhall fet downfome _ 
Experiments which do manifeft thefe things to: be probable and Jikely, 
which I have here deliver'd. its ids 0% gee 
For, firft, if you take any ting’d liquor whatfoever, efpecially ifit be 
pretty deeply ting’d, and by any means work it into a froth,the comgeries 
of that froth hall feem an opacous body, and appear of the fame colour; 
but much whiter than that of the liquor out of which it ismade. For the — 
abundance of reflections of the Rays againft thofe furfaces of the bubbles 
of which the froth confifts, does fo often rebound the Rays backwards; 
that little or no light can pafs through, and. ¢on fequently-the froth ap> 
Pa a if te f thefe ting’d liqu scale La — b a 
gain, 1f to any of thefe ting’d liquors that will endure.the boilin 
there be added a (mall wusctineh fine flower (the of which throu 
the Aficrofcope are plainly enough to be perceiv'd to confit of tranff 
rent corpy/cles) and faffer'd to boy} till it thicken the liquor, the mais 
the liquor wil appear epacows,and. ting’d with: the fame colour, but vet 
much whiten’d. eee 
