Talbot's "calotype" was the first negative-to-positive process and the direct ancestor of the modern photograph.

塔尔博特的“卡罗式摄影法”是第一种用负片洗印正片的方法，这种方法是现代摄影技术的直系鼻祖。

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Gold plays a very important rule in the pre-fogging process of the direct positive emulsion.

直接正性乳剂预灰化时，金有重要作用。

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Gold plays a very important rule in the pre-fogging process of the direct positive emulsion.

直接正性乳剂预灰化时，金有重要作用。

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