Whether it is more apt to describe cyanotype as invented - or discovered - by Sir John Herschel in 1842, is a question the reader may decide by the end of this essay. Whatever the verdict, it is well-known that this process of photographic contact-printing in Prussian blue was brought to light just three years after Louis Daguerre and Henry Talbot had announced their independent inventions of photography in silver, using metal and paper substrates, respectively.
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