A printing process using sunlight to transfer images onto a prepared surface, combining photography with traditional printing techniques.
From Greek 'helios' (sun) + 'typos' (impression) + 'graphia' (writing/description). Developed in the 19th century as an early photographic printing method that capitalized on the Sun's light-sensitive properties.
This is one of humanity's first attempts to harness the Sun's energy for practical purposes—long before solar panels, people were using sunlight to create permanent images on metal plates, inventing modern printmaking in the process.
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