Vitrified Caoutchouc.

Scientific American 16, 18.4.1868

Photographers will be interested in the invention of M. Marion described in the columns of the Moniteur de la Photographie. The new product appears to occupy a position midway between glass and paper, less fragile than the one and less opaque than the other. The use to which this transparent film of india-rubber is destined by its inventor is to receive the film of collodion bearing the photographic image. A glass negative is obtained in the usual manner, and upon the sensitized side of the plate the caoutchouc film is applied by means of a special kind of varnish. When it has become dried, the whole is plunged into a vessel of water and in a few moments the collodion with its image leaves the glass, adhering to the new medium, which latter may be now packed away until it is required to be used to print from.