(London, Richard and John E., Taylor, 1843. 4to. No wrappers as extracted from ""Philosophical Transactions"" 1843 - Part I. Pp. 1-6.
Reference : 42662
First appearance of a pioneer-paper in the history of early photography, as Herschel here for the first time describes his discovery of the iron printing process with ammonio-citrate of iron by both methods, namely with blue lines on a white background and white lines on a blue ground.
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