The book of lantern ; being a practical guide to the working of the optical (1888)

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THE BOOK OF THE LANTER'X, 149 1 that any one ignorant of the subject were to attempt to use such a colour as vermilion, which is opaque; it would appear to be of the usual vivid scarlet when seen on the glass, but seen through the glass, it would simply be a black patch, because the light cannot filter through ik This being the case with all the opaque colours, we there- fore discard them. I now annex a list of colours which are at the disposal of the slide-painter, and which are all more or less transparent. They are not all actually essential, but still the artist will do well to procure them, as they will give him an immense variety of tints :— Prussian Blue Brown Madder Indigo i Rose Madder Italian Pink Purple Madder A£f V" Raw Sienna v/ Crimson Lake V^ Yellow Lake Ivory Black Chinese Orange \ Burnt Sienna ,/ Neutral Tint McGilp. \f Brown Pink It will be noticed that there is only one brilliant blue in this list, that is Prussian blue. For landscape work this blue is used, perhaps, more than any other colour; for skies always, and it enters into the composition of the various greens, and forms useful tints with most of the other pig- ments. It is not the colour which an artist would choose by preference with which to depict the tender tints of the sky, for, truth to tell, it has a greenish hue, and is rather cold and repellent in character; but it is really the only blue which can be laid on the glass in a flat, even tint, and