Abstract

Abstract The art of reproducing photographs in ink by the ordinary process of printing, has been the object of numerous experiments … To substitute for the long, difficult, and costly processes employed in positive printing mechanical operations which long experience has rendered quick, sure, and economical to replace the metallic particles, the stability of which when employed on the surface of plates or papers is still problematical, by carbon, which when employed by the ancients for writing on papyrus has been proved to be more permanent than the woody fibre itself; these are advantages the attainment of which has for a long time excited the emulation of photographers.1

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