As the title suggests, while designing a QSL card, I had an idea that no one had explored printing methods before…
So I thought of cyanotype, and bought a simple set on Taobao along with some paper to test it. The results were surprisingly good, so I'd like to share the outcome:
(Each card printed using the blue-printing method is unique, just like every QSO (a colloquial term for radio contact).)
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