Experiments in Photography

Experiments in Photography
M. Niepce de St. Victor, in making some experiments in photography, finds that if a sheet of paper ors which there is writing or printed characters, or a drawing, be exposed for a few minutes to the vapor of iodine, and there be applied immediately afterwards a coating of starch moistened by slightly accidulated water, a faithful tracing of the writing, printing, or tracing will be obtained. If. Niepce has also discovered that a great number of substances, such as nitric acid, phosphoric acid, chlorurets of lime and me-cury, &c., act in a similar manner, and that various vapors, particularly those of ammonia have the effect of vivifying the images that are obtained by photography.

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