A photographic printing process that uses solar radiation and light-sensitive materials to create images, an early form of photomechanical reproduction.
From Greek 'helios' (sun) and 'typos' (impression, type). This term emerged in 19th-century printing technology when photographers first harnessed sunlight for reproduction.
Heliotypes were an early high-tech achievement—before digital photography, people literally used the sun to burn images onto printing plates, making it one of history's most literal examples of 'solar power.'
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