Passet was one of the pioneering artists to use the Autochrome process (
https://www.youtube.com/watch?v=VKINhG0g3kk), an early color photography technique developed by the Lumière brothers. This process, which used glass plates coated in microscopic grains of dyed potato starch, allowed for the production of striking, naturalistic colors. Passet's mastery of this technique set him apart as one of the first photographers to document the world in color, at a time when black-and-white images dominated the medium. His work showcased not only the technical innovation of color photography but also the rich diversity of his subjects.