An early photographic printing method that uses the Sun's light to create images on specially prepared plates or paper.
From Greek 'helios' (sun) + 'typos' (impression). This 19th-century technique emerged as photographers sought to make their sun-captured images permanent and reproducible.
Heliotypy was literally 'sun printing'—photographers discovered they could use UV light to harden certain compounds, creating the ancestor of modern photo etching and offset printing.
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