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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 61, page id 1677894601:0237
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61
transparent Steys in Wrhich vapors are not arrivedto that
erolnels requisite to retteet other Colours, as we find it
15 bY experience.
WBiteness, it most intense and luminous, is that ofthe
trst order, it less Arons and luminous a mixture of the
Colours ot several orders. OF this last kind is the
ertriteness oF Froth, Paper, Linnen, and most wrhite sub-
Aances: OF the Former I reckon that ot wrhite metals to
bC. For Whilsthe densest oF metals, Gold, it foliated
i5 transparent, and ai metals become transparent it
dissolred in menstruums or vitrihied, the opacity ot
Wrhite metals arileth not from their densiey alone. Phey p. S2
being less dense than Gold rould De more transparent
Than it, did not lome other cause concur with their den-
Cier to makce them opatie. And this cause I take tobe
Tuch a bionels ot their particles as fes them to reflect
the wrhite oF the Ars order. For it they beot other
thicknesses ther may refect other COlOurs, a5 IS IaNI-
Fest by the Colours rhich appear upon hot Steel in tem-
pering it, and Cometimes upon the Curtace oF melted
metals in the Skin or Scoria wrhich arises uxon them in
their coolino. And a5 the white ot the tirst order is
the Arongest which can De made by Plates oftransparent
substances, so it ouoht to be Aronger in the denser sub.
Itances oF metals than in the rarer OF AIT, Water and
Gta(S. NVor do I see but that metallic substances ot luct
a thickness as mav Atthem to reReet the wtite ot the
Ars order, may, by reason of their great density (accOr-
dins to the tenour of the trst ofthele Propolitions) re-
Aect aIl the Lient incident uxon them, and (0 DC as
opake and splendent as its possible for any Body tobc.
iold, or C opper mixed rith lels than halttheir weignt
ot