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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 60, page id 1677894601:0236
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(607
Blues and purples may be cither oF the second or third
order, but the best are of the third. Thus the COlOUF
oF riolets seems to be ot that order, because their Syrup
by acid Liquors turns red, and by urinous and alcali-
alC TUTNS greeM. For since it iS oF the nature oF ACIdS
to dissolve or attenuate, aud oF AIcalies to precipitate
or incrastate, if the purple Colour ot the Syrup iraS ot
the second order, an acid Liquor by actenuatinq its tino-
ins corpulcles vould chanse it to a red ot the Arst
order, and an AIcaly by incrassating them vould change
it to a preen ot the second order; Which red and oreen,
especially the oreen, seemtoo impertect to be the CO-
Jours produced by these changes. But il the laid purple
be supposed ot the third order, its change to red ot the
second, and sreen oE the third, may writhout any in-
convenience De alloved.
IF there De tound any Body ot a deeper and lels red-
dist purple than that ot the violets, its C olour most
probably is oF the second order. But vet their beino
no Body commonly known Wrhose Colour is constanttis
more decp thantheirs I hare made use oftheir name to
denote the deepest and least reddisti purples, luch a5
manifestly transcend cheir Colour in puritr.
The blue ot the first order, thouch verr faint and
little, may possiblr be the Colour oF. Tome substances;
and particulariy the arure COlour oF the Skys seems to
be oF this order. For alt rapours wrhen they beginto
condense and coalesce into linall parcels, become tirst ot
that bisnels wrhereby luch an Arure must be retlected
betore they can constitute C louds ot other Colours. And
(0 this being the hest Colour wrhich vapors begin to
refleet, it ought to bethe Cvlour oE thetinest and most
traML