Sepia prints (1880s–1920s)
Typically the oldest and most damaged photos in a collection. Expect foxing (brown spots), fading, creases, and sometimes silver mirroring — a metallic sheen on dark areas. Note: daguerreotypes, tintypes, and ambrotypes from this era cannot be processed by AI restore models — seek professional conservation.
Black-and-white prints (1920s–1960s)
Generally in better condition than sepia-era prints. Common issues are fading, minor scratches, and soft focus from consumer cameras of the time.
Color prints (1960s–1990s)
Color dyes fade at different rates, so these often have a strong color cast — usually magenta or yellow. The image itself may be in good structural condition.
Polaroids
Unique challenges: the white border often yellows, colors shift toward blue-green, and the image area is small with inherently lower resolution.
Slides and negatives
Require proper scanning first — a flatbed with a transparency adapter at 2400+ DPI. Once digitized, slides are often in excellent condition since they were handled less than prints.
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