Photographic Properties of Polyethylene Oxide IV. Effect of PEO on the rate ot conversion of silver bromide into iodide

Abstract

The effect of polyethylene oxide (PEO) on the rate of conversion: $${\text{AgBr + I}}^{-2}\to {\text{ Agl + Br}}^{-}$$ was investigated. The conversion in aqueous gelatin solution was accelerated by PEO. The acceleration became pronounced when the molecular weight of PEO was larger than about 600, and increased with increasing ionic strength. Gelatin, polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) retarded the conversion and the retardation was reduced remarkably by adding PEO.