The technique of making blueprints, also known as cyanotypes, is one that originated over a hundred years ago.

制作蓝的技术，也称为相法，起源于一百多年前。

Nowadays the technique is preserved by artists and photographers interested in the niche, and their professional cyanotypes are no doubt much better than my own amateur attempts.

如今，这项技术对小众感兴趣的艺术家和摄影师所保留，他们的专业蓝比我自己的业余尝试要好得多。

I will share some of my favorite books about history in the description bar, as well as details on how to make your own cyanotype.

我将在描述栏中分享一些我最喜欢的关于历史的书籍，以及如何制作自己的蓝图的细节。