Chambers's Edinburgh Journal.
William and Robert Chambers,
Editors of Chambers's Educational Course, 'Information For The People,' &c.
Nos. 366 to 391. January-June, 1851.
Published by William and Robert Chambers,
and W. S. Orr, London.
Chambers's Edinburgh Journal. No. 385. New Series.
Saturday, May 17, 1851.
It is well known that the combination of two complementary colours produces white; and this is usually shown in lectures by employing two glasses - one of a red, and the other of a green colour, the tints of which, alhough of considerable intensity, entirely disappear during the simultaneous interposition of the glasses between the eye and the source of light. M. Maumené several years since arrived at the same result by using coloured liquors, and especially by mixing a solution of cobalt with one of nickel, both perfectly pure, and so diffused that their colour is nearly of equal intensity. The rose-red colour of the cobalt is completely destroyed by the green of the nickel, even in concentrated solutions, and the mixed liquid remains colourless.
- Journ. de Pharm. et de Chim., Mars 1850: Philos. Mag., No. 244.