Salmon, William: Polygraphice: Or, The Arts of Drawing, Engraving, Etching, Limning, Painting, Washing, Varnishing, Gilding, Colouring, Dying, Beautifying and Perfuming: In Four Books ... To which is added A Discourse of Perspective and Chiromancy (London, 1675)

Ch.ij. ' OfVeg etabk Colours?&c. i 83
of oyl of Vitriol the resolvcd Lead would precipitate
white, leaving the liquor of a clear, high red colour
again.
XXVIII. We have not yet found, that to exhibit
sirong variety of colours, there need beimployeda-
ny more than thesc five, White, Black, Red, Blew,
Yellow : sor these being varioussy compounded and decom-
pounded exhibit a variety and number os colours i sitch as
tbose who are grangers to -painting can hardly imagine.
XXIX. So ElacfyiRd White varioussy mixed, make
a vast company of light and deep Grays : Blew and
Tellow, many Greens'. Remand Tdlm>^ Orange-taw-
neis: Red and White', Carnations: Red arid Blew, Pur-
ples, &c. producing many colours for which we want
names.
XXX. Acid salts destroy a blew colour: Sulphu-
reous, Urinous or sixed restore ir.
XXXI. Acid and AlcalizateCalts, with many bodies
that abound with Sulphureous or oyly parts will pro-
duce a red, as is manifest in the Tin&ure of Sulphur,
made with Lixiviums of Calcined Tartar or pot-
atoes.
XXXII. Lastly, it may be worth tryal (smce it hath
succeededin same experiments) soto takg away the colour
es a Liquor, as that it may be coleurless : which in what
we have tryed, was thus: first by putting into the
Tincture, Liquor, or Juyce, a quantity of the solution
of pot-atoes or oyl of Tartar per deliquium, and then
affusing a good or strong solution of Alom, which in,
our observations precipitated the tinging matter, or
gathered it into one body ( like as it werecurdsj and
io left the Liquor tranfparent and clear as Crystal.

CHAP.