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passed through the colour sensitiser
the film is wound upon a large drum
and dried, this operation being acceler-
ated by rotating the drum at a high
speed in a current of warm air. When
dry the film is wound upon the spool
ready for use. As may be supposed, the
operation is somewhat slow, about
three hours being occupied under the
most favourable conditions in the
process of sensitising and drying. It is
imperative that the film, after being
A frame from the Kinemacolor film A Visit to the Seaside

Another Kinemacolor frame grab. Note the color fringing of the edges of rapidly moving images
sensitised, should be used as soon as possible. It deteriorates rapidly; the sensitiveness of the
emulsion to red light becomes impoverished through keeping, the life of stock so treated being,
as a rule, one of only a few weeks.

Another objection to colour cinematography is the expense. When the three primary col-
ours—red, green, and violet—are used, demanding a photographing and projecting speed of
forty-eight pictures per second—sixteen per second through each screen—as compared with
sixteen pictures per second with black and white work three times the quantity of film has
to be used. Accordingly, the expense of the film alone is three times as heavy. The further

20 REEL DEALS September 2017