Note 4 — Chapter I · THEORY OF SILVER PRINTING.
Reading edition
Footnote [4] With the former we have this action— Silver Chloride gives Silver Sub-chloride and Liberated Chloride. Ag2Cl2 = Ag2Cl + Cl With the latter the silver in combination with the organic matter, which is in a state of oxide, is probably reduced to the state of sub-oxide.