GB441325A - Improvements in and relating to colour photography - Google Patents

Abstract

441,325. Colour photography. KODAK, Ltd., Kingsway, London.-(Eastman Kodak Co. ; 343, State Street, Rochester, New York, U.S.A.) June 15, 1934, No. 34725/35. Divided out of 440,032. [Class 98 (ii)] A photographic-sensitive element such as a film has inseparably coated on a single support at least three gelatine silver halide emulsion layers differentially sensitive to colours substantially covering the whole of the visible spectrum, in which a layer sensitive to blue but insensitive to colours to which the other layers are sensitized is the sole light sensitive layer on one side of the support, the layers on the other side of the support are uncoloured, and between the blue-sensitive layer and the support is arranged a water-pervious decolourable yellow filter layer. The two layers on the opposite side of the support to the blue-sensitive layer may be sensitized to red and green with naphthocyanol and erythrosin respectively, and the red layer may be nearest the support, which is of cellulose nitrate or acetate. A thin colourless gelatine layer may be interposed between the red-and green-sensitized layers, and another similar layer may be interposed between the blue sensitive layer and the yellow filter layer. The yellow layer may be coloured with tartrazine, quinoline yellow or brilliant yellow. A transparent waterproof stripping layer of benzyl cellulose may be coated on the blue sensitive layer, and a removable anti-halation layer may be coated on the green sensitized layer. A filter may be employed during exposure. Specifications 245,198, [Class 98 (ii)], 327,714, 333,902, [both in Class 2 (ii)], 356,308, [Group IV], and 440,089 are referred to.