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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 87, page id 1677894601:0107
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There is vet another material circumstance oF thIS
Fixperiment. For this emergins Light being by a third Fic. 22.
Prilm FIIK retracted torrardsthe Paper PP, and there Part 1.
Daintins the usual Colours of the Prism, red, vellou,
sreen, blue, violet: IF these Colours arose from the
retractions of thac Prilm moditvins the Light, they
ronld not be in the Light betore its incidence on that
Prilm. And vet in that Fixperiment re Found that
Wvtren brturnine the trro Arlt Prisins about their com
ion AXis aII the Colours vere made to vani but the
red; the Lisht rhich makes that red beins letr alone,
appeared ot the verr Pame red Colour betore its inci-
dence on the third Prism. And in general ve find by
other Fxperiments that when the rars erhich ditter in
retransibilitr are separated From one another, and auy
one Cort ot them is considered apart, the Colour ot the
Lisht irhich ther compose cannot De changed by any
retraction or reflexion whaterer, as it ougnt to beWere
Colours nochins else than modifications ot Light cauled
Oy retractions, and reflexions, and Padous. This un-
changeablenels ot Colour J am nou to describe in the
Follorrins Propolition.
PROP. TI. THFOR. TI.
Al homoreneat Feht has its proper Colour anfrverine to
its deoree of refransibility, and that Colour cannot be
chansed by reflexions and refractions.
In ThC ExperimentS OF thC Ath Proxolition oF the Firs
B0oK, Wrhen l had separated the heteroseneous rays
om one another, the Spectrum pt Formed by the sepa-
ratect