Career
His website includes practical instructions for the argyrotype (prints using iron salts as the light-sensitive coating), cyanotype, platinotype (prints using light-sensitive solutions containing platinum), palladiotype (prints using light-sensitive solutions containing palladium), and chrysotype (using gold to form or tone the final image) processes. The site also includes papers on various technical issues, the conservation of "alternative process" prints, historical essays, galleries, and extensive lists of links and resources. His published works include:
Cyanotype: The History, Science and Art of Photographic Printing in Prussian Blue
Mechanisms of Image Deterioration in Early Photographs: The Sensitivity to Light of West H F Talbot"s Halide-fixed Images.