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首页> 外文期刊>Journal of Imaging Science and Technology >A New System for Forming High-Contrast Direct-Positive Images
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A New System for Forming High-Contrast Direct-Positive Images

机译：形成高对比度直接正像的新系统

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摘要

A very-high-contrast direct-positive image was obtained when a prefogged AgBr photographic emulsion containing certain bipyridinium salts, such as 1-n-butyl-4-(4′-pyridyl)pyridinium bromide hydrochloride (Compound 1), was processed with a developer that contains Metol and ascorbic acid as developing agents. Results of photographic and electrochemical studies suggested that Compound 1 has two functions, as an electron acceptor and as a precursor of a nucleator. A theory was developed that, during exposure, Compound 1 acts as an electron acceptor, which produces a direct-positive image, and that Compound 1 is neutralized during development to form 1-n-butyl-4-(4′-pyridyl)pyridinium bromide (Compound 2), which acts as a nucleator during development and produces very-high-contrast images.
机译：将含有某些联吡啶鎓盐（例如1-n-丁基-4-（4'-吡啶基）溴化吡啶鎓盐酸盐（化合物1））的预雾化AgBr摄影乳剂用以下溶液处理时，可获得非常高对比度的正正像含有甲醇和抗坏血酸作为显影剂的显影剂。照相和电化学研究的结果表明，化合物1具有两种功能，作为电子受体和成核剂的前体。发展了一种理论，即在曝光过程中，化合物1充当电子受体，产生正正像，并且化合物1在显影过程中被中和形成1-n-丁基-4-（4'-吡啶基）吡啶鎓溴化物（化合物2），在显影过程中充当成核剂，并产生非常高对比度的图像。

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