I know not whether it will be requisite to subjoyn on this Occasion, what I
tried concerning Reflections from Colour'd Glasses, and other Transparent
Bodies, namely, that having expos'd four or five sorts of them to the Sun,
and cast the Reflected Beams upon White Paper held near at hand, the Light
appear'd not manifestly Ting'd, but as if it had been Reflected from the
Impervious parts of a Colourless Glass, only that Reflected from the Yellow
was here and there stain'd with the same Colour, as if those Beams were not
all Reflected from the Superficial, but some from the Internal parts of the
Glass; upon which Occasion you may take notice, that a Skilfull Tradesman,
who makes such Colour'd Glass told me, that where as the Red Pigment was
but Superficial, the Yellow penetrated to the very midst of the Plate. But
for further Satisfaction, not having the Opportunity to Foliate those
Plates, and so turn them into Looking-glasses, we Foliated a Plate of
_Muscovy_ Glass, and then laying on it a little Transparent Varnish of a
Gold Colour, we expos'd it to the Sun-beams, so as to cast them upon a Body
fit to receive them, on which the Reflected Light, appearing, as we
expected, Yellow, manifested that Rebounding from the Specular part of the
_Selenitis_, it was Ting'd in its return with the Colour of the Transparent
Varnish through which it pass'd.
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