Process for the production of photographic printing ink or grained from the pure black in the absolute white without alteration of the intermediate tones

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  机译： 具有纯黑色调的卤化银黑白照相感光材料

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  机译： 黑白照相材料中图像色调的改变

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  机译： 黑白照相材料中图像色调的改变

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