And shall in this place both
Recapitulate most of the things I have Dispersedly deliver'd already
concerning that Subject, and Recruit them.
And first, whereas Painters (as I noted above) are wont to make Green by
tempering Blew and Yellow, both of them made into a soft Consistence, with
either Water or Oyl, or some Liquor of Kin to one of those two, according
as the Picture is to be Drawn with those they call _water Colours_, or
those they term _Oyl Colours_, I found that by choosing fit Ingredients,
and mixing them in the form of Dry Powders, I could do, what I could not if
the Ingredients were temper'd up with a Liquor; But the Blew and Yellow
Powders must not only be finely Ground, but such as that the Corpuscles of
the one may not be too unequal to those of the other, lest by their
Disproportionate Minuteness the Smaller cover and hide the Greater. We us'd
with good success a slight Mixture of the fine Powder of Bise, with that of
Orpiment, or that of good Yellow Oker, I say a _slight_ Mixture, because we
found that an _exquisite_ Mixture did not do so well, but by lightly
mingling the two Pigments in several little Parcels, those of them in which
the Proportion and Manner of Mixture was more Lucky, afforded us a good
Green.
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