Chemically produced silver clusters lead to a 476 nm peak in the diffuse refletance spectra(DRS)of AgBr emulsions. Earlier photobleaching studies have shown that this peak can be resolved into two component peaks-one at 474 nm which photobleaches, and a less intense one at 482 nm that does not. The 474 nm peak has been assigned to hole removing silver clusters. This interpretation has been questioned since photoproduced silver clusters, which are obviously electron trapping, are also known to photobleach(solarization). This possibility was examined with photoproduced silver clusters and photobleach conditions which were identical to those used for the earlier photobleach study.
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