Herschel – Cyanotype
赫歇尔-蓝晒法工艺
1842 – Introduction of the cyanotype process, also known as the blueprint process,by Sir John Herschel (1792 – 1871) a British astronomer who was trying to find a way of copying his notes.
1842——英国天文学家约翰·赫歇尔爵士（1792-1871）介绍了蓝晒法工艺，也被称为蓝图晒印法，他试图找到一种复制笔记的方法。
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