Collodion printing-out paper (POP) met with limited commercial success until it began to be manufactured by the Obernetter family in Germany in the mid-1880s.

Collodion printing-out paper included a baryta layer that was a milestone in the evolution of photographic materials. “Baryta” refers to a combination of barium and strontium sulfates that brightens images by scattering light back through the silver image layer. The baryta layer also prevents impurities from the paper fibers from contaminating the silver layer. With this addition to the paper support, prints were smoother, whiter, and glossier than those made on albumen-coated paper, which soon fell from favor. Many different companies offered precoated printing-out papers, including Kodak and Ilford. Trade names for these papers included Aristo and Solio.