Somebody taped a photo into an album in 1978. That tape is now a yellow-brown rectangle and the carrier strip peeled off years ago, taking a thin skin of emulsion with it. What's left is a hard-edged stain on the print plus a ghost outline where the adhesive migrated past the tape edges.

What causes tape marks on old photographs

Pressure-sensitive tape damage unfolds in three phases, well documented in paper conservation literature. First, the adhesive — historically rubber-based, later acrylic — is pressed onto the print and bonds to the gelatin emulsion. Second, over years the rubber adhesive oxidizes and its lower-molecular-weight fractions migrate into the paper and binder, producing a yellow-brown stain that is chemical, not just dirty. Third, the tape carrier loses cohesion with its own dried-out adhesive and falls off, usually taking a thin layer of emulsion with it and leaving an amber ghost where the sticky zone was (AIC Book and Paper Group).

The Book and Paper Group wiki on hinge and adhesive removal notes that acrylic pressure-sensitive adhesives are chemically stubborn — they're not soluble in the solvents used in traditional paper conservation, so even professional treatment can't always eliminate the stain (BPG Wiki). Smithsonian Libraries' "The Fix" post is explicit that the residue behaves as a permanent discoloration once it has penetrated the substrate (Smithsonian Libraries blog).

Visually: a rectangular yellow-brown patch with slightly darker edges, often with a cleaner "halo" just inside the patch where the tape actually sat, and a lifted or torn strip if the carrier pulled on removal.

How AI handles tape marks — and where it can't

PhotoFlip treats a tape mark as a two-layer problem — a color cast and an inpainting task stacked on top of each other:

• The color cast is handled first. The model recognizes the rectangular shape with soft amber gradation and normalizes it against unaffected image regions.
• Where the tape lifted emulsion, the pipeline runs inpainting over the torn strip, synthesizing plausible content from the surround.
• For tape-crossing-a-face, the face-restore prior takes over inside the face bounding box because general inpainting tends to produce uncanny eyes and mouths.

Honest limit: where adhesive has soaked into the paper and altered the underlying image density, AI is approximating the original tone, not recovering it. If the tape sat over a patterned background — wallpaper, a dress fabric — the pattern reconstruction is educated guessing, not memory.

Example restorations

• Magnetic album pages from the 1980s. Wide tape strips across the tops and bottoms of every photo. The regular, rectangular shape of the damage makes it a clean inpainting problem and the model handles it well.
• Taped-corner photo. Four small triangular tape marks at the corners plus a central clean zone. AI handles the corners individually and leaves the center untouched.
• Masking-tape repair of a torn photo. A strip of tape was used to hold two halves of a torn photo together. Here the tape removal is interleaved with tear repair — the pipeline does both in one pass but it's a harder case.

How to restore a photo with tape marks

1. Do not try to peel surviving tape off before scanning. A dry peel will rip more emulsion. Scan the photo as-is with the tape in place.
2. Upload at photoflipai.com/restore. The model treats the visible tape and its stain as part of the damage mask.
3. If the result still has faint rectangular ghosting, run the file through a second restore pass — the model's second iteration is working from a cleaner input and usually finishes the correction.

Related: tape damage often co-occurs with yellowing of the rest of the print and with missing-corners where the tape literally pulled corners off. Pricing at pricing, pipeline at how-it-works.