Bob W. answered 10/24/19
Commercial Photographer & Skills Coach
Calotype, also known as Talbotype.
William Henry Fox Talbot pioneered a technique using silver chloride as the foundation for recording crude images onto a substrate that was refined to eventually give birth to film photography in the mid-1800's. Talbot used the term "Calotype" to describe his process and his images were also referred to as "Talbotypes."