Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 78
ess, giving byone operation pictures withlights correct, is of much inte-rest, I gave it for a very considerabletime my undivided attention. The mostextraordinary character of the bydriodicsalt is, that a very slight difference in thestrength of the solutions, in the composi-tion of the… … their deep blackness is produced almost as ra-pidly. Sometimes these opposing actionsare in equilibrium, and then the paper con-tinues for a long time perfectly insensible. The uncertainty attending the applica-tion of these salts, arising from the abovecause, has greatly circumscribed their useas…
Photography · Art and photography
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