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Dec, 1 936Jan., 1937 The Joumal of the Association of CineTechnicians
107
contributed to improve results. In spite of this, however, it was not until the middle of last year that the British Chemicolour Process could be considered perfected. Countless tests of interior and exterior shots, completed under both good and bad conditions, with the co-operation of Otto Kanturek, Alfred Black and Ralph Francke, all A.C.T. members, have proved the process in picture and colour quality a success.
It is a subtractive process based on the four spectral colours of the colour spectrum (Yellow, Red, Green and Blue), and is produced by means of a genuine photographic galvanochemic system. The negative is sensitised to the four colours, and is exposed complementarily, so that after development of the negatives, which are controlled exactly by means of a sensitometer so that they remain equal in intensity and density, the actual print produces the same natural complementary colour picture which was photographed.
The Chemicolour camera is of the modern standard type, with colour corrected lenses, and a device which can guide several negativ^es through the camera without danger of shrinkage, damage, or any unsharpness, and afford them correct transportation and exposure. Therefore every good standard camera can be adapted and used for the Chemicolour Process. The light balance and the balance of the complementary colours respectively are not achieved by using rotating filters or mirrors, but by the use of a filter in front of the lens on exterior work, and the filtering of the lights in the studio, whenever necessary.
The actual printing of Chemicolour copies is carried out, as in the case of black and white films, by mechanical means, and can be shewn on the screen in colour within 48 hours of shooting.
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JAMES A. SINCLAIR & CO. LTD.
3 Whitehall, London, S.W.I
SECON D
A.C.T. BALL AND
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— CHILTERN COURT —
BAKER STREET, N.W.I
FRIDAY, DECEMBER 4th, 1936
8 p.m. to 2 a.m. (Licensed till 2 a.m.) — — •
LEO CROKE AND HIS TRACKMAKERS
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