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Abstract
A new role for dyes in the photographic development system has been observed. Contrast and apparent photographic speed were substantially increased when a photographic film was developed using a developer containing an aminophenol-type developing agent and sodium ascorbate in the presence of cyaninc and merocyaninc dyes. It was found that the addition level of sodium ascorbate greatly affected the photographic speed and contrast. It was suggested that the dyes acted as contrast enhancing agents during development.