This project investigates the photozincographic metal plates from the Lactário Museum’s collection in Lisbon, Portugal, focusing on their manufacturing techniques, materials, and corrosion behavior. The study examines 33 plates (1927–1971), providing insights into the evolution of photozincography in the 20th century.

Findings show that manufacturing variations in matrix patterns were influenced by studios and photographers. Corrosion analysis highlights the impact of the museum’s coastal and urban environment.

The research underscores the risk of image loss due to pitting corrosion and ink deterioration, reinforcing the need for improved conservation and display strategies. This study is a crucial step in preserving photozincographic metal plates, an overlooked part of scientific heritage.