Photograph the settled sample jar(s) against a plain, front-lit background — container fully in frame, held upright. For the most accurate read, one jar per photo, shot side-on at eye level. Up to three jars are accepted. If capture hides a verdict-critical detail, you'll be asked to retake just that — not the whole shot.

Beta note: submitted photos and their diagnoses are retained so we can assess and improve the tool.