PHOTOGRAPHING COLOURS.

New Zealand Herald, Volume XLIV, Issue 13537, 7 September 1907, Page 2 (Supplement)

PHOTOGRAPHING COLOURS.

It is often felt by amateurs and others that the, scenic effects which can be obtained by the aid of ■photography -would be oven more beautiful if they gave the colours of the objects photographed. Processes arc already in existence for obtaining this result, but they are generally regarded as unsatisfactory. At a recent demonstration Mr. 11. Child Bayly introduced a plate which, it is claimed, is entirely successful, and, although it is expensive, its expense is compensated for by the advantages it' possessed as a picture producer. In the current number of Photography Mr. Bayly explains the process. ' He" says:"lt is only our old friend the throe-colour process in a new guise; only, instead of interposing screens, getting three negatives, making positives, and 'superposing ::u registration, all is lumped into one. The glass is first coated with some tacky adhesive, on which is spread a- layer of ' transparent grains of starch. 'These grains are all -of a- size. They are of three kinds—oue dyed an intense violet, one a - vivid green, and one a brilliant orange. The dyed starch grains are thoroughly mixed in such proportions that, when dusted over the plate, the colour light passed by them, being combined by the eye, as the grains are very small, looks perfectly white, and without any trace of colour whatever. The interstices between the starch grains are then tilled up, in some way not described, with black particles—carbon in some form —and no light whatever can pass through the plate except through the dyed starch grains. So that," although every particle of light passing through such a plate is vividly coloured by the starch, yet on holding it up to the light the plate only looks : much like a piece of finely-ground glass, without perceptible colour.'" The manufacturers of the'new plate are Messrs. Sumiere, of Lyons, and the price of each plate is equivalent to 2s 6d in English money. ■■** '•>■■■ -: °-\