A photographic process used to create printing plates by using sunlight to expose a chemically-prepared metal surface that can then be etched or engraved.
From helio- (sun) plus 'engraving' (the art of cutting designs into surfaces), describing a printing technique that uses solar exposure.
Helioengraving was revolutionary for printing—instead of manually engraving metal plates, photographers could use the sun to do the work, making mass printing way faster!
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