Cyanotype
Cianotipia
- Date
- 1842 · confidence high
- Place
- London, United Kingdom
- Credited to
- John Herschel
- Field
- Communication
What it is
A slow-developing photographic process sensitive to ultraviolet and blue light, producing monochrome deep-blue prints using just two iron salts and water. It is still used in art and gave its name to technical "blueprints".
What it led to
- Architectural and engineering blueprints
- The first books illustrated with photographs (Anna Atkins's algae, 1843)