Summer QoTD #36

The process to produce these relied on using photosensitive ferric compounds, impregnating paper with such chemicals and finally forming insoluble ferroferricyanide, leading to a characteristic colour. Due to the photosensitive compound, the process could be used for replication of drawings, producing a negative of the original. It was extensively used by engineers, due to its simplicity.
What is the end result of this process called?


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