1. A photomechanical printing process in which an image is transferred to a metal plate using the action of light, used to produce prints or engravings.
Usage: technical; historical; printing and photography

Examples

• The museum's collection includes rare heliotypy prints from the 19th century.
• Heliotypy was an important precursor to modern photographic printing techniques.
• The artist experimented with heliotypy to create detailed reproductions of his drawings.
• Early photographers adopted heliotypy as a reliable method for mass-producing images.