EXPERIMENT XV.
I Endeavour'd to try what alteration would be made in Colours by the use of a Colour'd Prism; but I found, that it was too difficult to
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I Endeavour'd to try what alteration would be made in Colours by the use of a Colour'd Prism; but I found, that it was too difficult to
get such as I desir'd, since whatever Pigments a Prism was Colour'd with, they would make it too Opake for our Purpose.