Abstract
AbstractA gelatin was thoroughly freed of labile sulphur by washing and heating with an excess of emulsion grains which were then removed by centrifugation. An emulsion made with this gelatin was found to be sensitized by silver-digestion1 which process is thus shown to be distinct from sulphur sensitization. Silver-digested emulsions can be distinguished from sulphur-sensitized by their response to ferricyanide solutions. A condition of mixed sensitization is also possible. It is concluded that the sensitizing substance responsible for sulphur sensitization is not the same or is not in the same state as that resulting from silver-digestion or reduction sensitization in general.
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