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This guy is known as a cyanotype print. Instead of going through the entire, arduous process, I’ll link all ya’ll interested to the Wikipedia page below. Essentially, it’s both a long and rewarding process in which your negative is printed on coated paper to come out as this blue, vintage-y awesomeness. Cyanotype printing is an incredibly old photography style in the same vein as Van Dyke Browns. I miss doing these types of experiments back in high school.
