| 摘要 |
Photographic silver halide elements are described which comprise incorporated in a silver halide emulsion layer or another water-permeable colloid layer a hydroquinone silver halide developing agent precursor of which at least one of the hydroxyl groups of said hydroquinone has been esterified to form a hydrolyzable aliphatic acyloxy radical comprising a quaternary ammonium group. Upon treatment of the exposed elements with an alkaline solution the developing agent precursor hydrolyzes readily to yield the active developing agent so that no delay in development occurs. The resulting developed images are free from spots, do not show fog and possess the desired sensitivity and gradation with normal or even shorter length of development time.
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