An advert for the Collotype process offered by The London Stereoscopic Company, 1903. Collotype is a dichromate-based photographic process which was invented by Alphonse Poitevin in 1856. From Penrose's Pictorial Annual 1903-4, edited by William Gamble. [A. W. Penrose & Co., London, 1903-4]
Pixel Dimensions (W x H) : 3522x5142
File Size : 53,058kb