Fern Cyanotype

In 1843 the botanist Anna Atkins self-published *Photographs of British Algae: Cyanotype Impressions* — the first book illustrated with photographic images. Using Herschel's cyanotype process, she laid algae and ferns directly on sensitized paper and exposed them to the sun, fixing white silhouettes onto a deep Prussian-blue ground.

This system distills that monochrome blueprint vocabulary: a single saturated cyanotype-blue field, crisp white photogram figures, soft sun-exposed edges, and Victorian serif captions. The ground is always blue — never cream, never white.

1843 年，植物学家安娜·阿特金斯自费出版了《英国藻类：蓝晒法图谱》——这是史上第一本以摄影图像作插图的书籍。她借助赫歇尔发明的蓝晒（氰版）工艺，把藻类与蕨叶直接铺在感光纸上经日光曝晒，将洁白的剪影定影在深邃的普鲁士蓝底色之上。

本设计系统提炼了这种单色"蓝图"的视觉语言：单一饱和的氰版蓝场域、清晰的白色光影图样、被阳光晒出的柔和边缘，以及维多利亚时代的衬线体说明文字。底色永远是蓝——绝不是米色，也绝不是纯白。