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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 112, page id 1677894601:0132
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=132
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L
certain mixture oF Orpiment and Viridi ris in a due
proportion, the mixture lost its purple tincture, and be.
came perfectlr dun. But the Lxperiment succeeded Best
without Minium thus. Po Orpiment I added by little
and litele a certain FuII briohe purple, wrhich Painters
rise until the Orpiment ceased to Dc rellorr, and became
oF a pale red. Then I diluted that red by addine a
litele Viride Airis, and a litele more blue Bile than i
ridi Aeris, until it became ot such a grer or pale White,
a5 versed to no one oF the COlours more than to ano
cher. For thus it became of a Colour equal in wrhite
nelS EO thaE OF ACtes Or OF Wood nely CUL, Or OE a
MlansSKin. The Orpiment rehected more LighE Fhan
did aur other of che Porrders, and theretore conduced
more tothe irhitenels of the compounded Colour than
tier. L0 alsion the proportions accurateiz may De
difficult, by realon of the different, goodnels oF POW-
ders of the lame kind. Accordinsly a5 the COlour ol
any Porrderis more or less FuII and luminous, it ought
to be uled in a lels Or greater proportion.
Nor considerins that thele erer and dun Colours
may be alio produced by mixins ertites and blacks, aud
br consequence ditter trom pertect wrhites not in Species
ot Colours but ontr in deoree otluminousnels, it is ma
nifest that there is nothins more requisite to make
them perfectly irhite than to increase cheir Lioht sutr
ciently; and, on the contrary, il by increatins their
Lichether can bebrouehe to pertect irhiteness, it rill
chence allo follo, that they are ot the lame Species ot
Colour vrith the best irhices, and difser From them only
in thequantier of Light. And this I trred as FolIOIS.
ltook thethird of the abore mentioned orer mixtures
chac