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May, 1952
l;ko\VX: PROBLEMS oi STORING FILM
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putting a layer of colour over the whole picture, so that the " whites " become coloured, while the " blacks " are still black. In a toned image, the " whites " remain white, while the " blacks " are coloured. Some scenes were both tinted and toned. In this case when the " whites " are one colour and the " blacks " are another and this is duped into the present panchromatic F.G. Dupe Negative Stock, the resulting copy may reveal little contrast between them. Many of the dye tones used have faded severely so that the images are now only faint. In the face of all this the labora
little quality as possible when duping, since a loss in tone rendering or definition which in itself is quite indiscernable may well become intolerable when repeated a number of times. For this reason some value may be found in photographic processes other than the silver halide type now in exclusive use in kinematography. I am thinking of the old collodion process and a new metal diazonium process which, it is claimed, can achieve a resolution several times greater than that attained by any present emulsions.8
Fig. 7. Artificial ageing test.
tories are very co-operative and take a lot of trouble to get as good dupes as possible. This sort of work calls for departures from their normal routine, and departures which are apt not to be commercial propositions. A commercial laboratory cannot be expected to maintain printers which will fit excessively shrunk film, and the small perforations of early days. To do this the Library will almost certainly, at some time, have to provide its own printer.
In order to survive for the hundreds of years which we envisage, it may be necessary for a film to be duplicated several times. It is therefore clearly desirable to lose as
Problems of Colour Films
Apart from tinted films, although there were very few natural colour films during the silent period, there were many films naturalistically coloured; at first, freehand and later through stencils. The reproduction of the very pleasant effects which were often obtained by these means, is another problem which so far remains unsolved. Present colour stocks seem to be incapable of matching the rather delicate colours concerned. Even if a match were obtained, on an integral tripack material, it would probably be of little value since there is no assurance of the permanence of the dyes