Galton produces by exposing two negatives on the same sensitised paper for ten seconds or so consecutively. [Please select]
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Refinement enveloped Paul Destournelle--refinement, over-sensitised and under-vitalised, as that of a rare exotic forced into precocious blossoming by application of some artificial horticultural process. [Please select]
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It is used in photography for the preparation of the films on the sensitised plates, and many other purposes. [Please select]
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