This app recolors a photo you already have so faint marks are easier to look at. Advisory visualization. Not a lab spectrometer, not real UV photography hardware, not a forensic proof of hidden ink, not OCR, not a claim of scribal truth. Synthetic UV is a 365–400 nm look from an ordinary photo. Balance never invents marks. The human still reads the page.
Drop a PNG or JPEG of a manuscript page, or tap Add file. Sample page draws a fake parchment so you can try without a photo.
No file yet.