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追溯历史：1842年John Herschel发明了一种能制作持久保存的蓝色照片的成像工艺。这是一种通过日晒成像的工艺，利用铁离子在紫外线的照射下可以生成普鲁士蓝色调物质的特性，晒出蓝色的照片， 被称为“蓝晒法”(Cyanotype)
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