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By his twenties, he had mastered complex photographic techniques like the collodion process, enabling him to develop large-format glass plates under harsh conditions.

She made them with the 19th-century wet-plate collodion process.

He produced more than 120 glass plate negatives using the wet collodion process which required him to travel with a portable laboratory.

The wet collodion process, which was invented in 1851, gave photographers the ability to make direct contact prints from a glass negative.

Looking at the images, John Ravenal, who organized her 2010 survey “Sally Mann: The Flesh and the Spirit” at the Virginia Museum of Fine Arts in Richmond, was struck by how Ms. Mann choose not to use her signature wet-plate collodion process, which typically gives her images a high degree of distortion and painterly sensuality.