But because all those opacous colours have two kinds of beams or Rays reflected from them, that is, Rays unting’d, which are onely reflected from the outward surface, without at all penetrating of the body, and ting’d Rays which are reflected from the inward surfaces or flaws after they have suffer’d a two-fold refraction; and because that transparent liquors mixt with such corpuscles, do, for the most part, take off the former kind of reflection; therefore these colours mixt with Water or Oyl, appear much deeper than when dry, for most part of that white reflection from the outward surface is remov’d.  Nay, some of these colours are very much deepned by the mixture with some transparent liquor, and that because they may perhaps get between those two flaws, and so consequently joyn two or more of those flaw’d pieces together; but this happens but in a very few.

Now, to shew that all this is not gratis dictum, I shall set down some Experiments which do manifest these things to be probable and likely, which I have here deliver’d.

For, first, if you take any ting’d liquor whatsoever, especially if it be pretty deeply ting’d, and by any means work it into a froth, the congeries of that froth shall seem an opacous body, and appear of the same colour, but much whiter than that of the liquor out of which it is made.  For the abundance of reflections of the Rays against those surfaces of the bubbles of which the froth consists, does so often rebound the Rays backwards, that little or no light can pass through, and consequently the froth appears opacous.

Again, if to any of these ting’d liquors that will endure the boiling there be added a small quantity of fine flower (the parts of which through the Microscope are plainly enough to be perceiv’d to consist of transparent corpuscles) and suffer’d to boyl till it thicken the liquor, the mass of the liquor will appear opacous, and ting’d with the same colour, but very much whiten’d.

Thus, if you take a piece of transparent Glass that is well colour’d, and by heating it, and then quenching it in Water, you flaw it all over, it will become opacous, and will exhibit the same colour with which the piece is ting’d, but fainter and whiter.

Or, if you take a Pipe of this transparent Glass, and in the flame of a Lamp melt it, and then blow it into very thin bubbles, then break those bubbles, and collect a good parcel of those laminae together in a Paper, 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.