| Possible ambergris | Waxy, rounded, grey, black, brown or pale | Waxy, firm, lighter than expected | Marine, earthy, musky, sometimes unpleasant when fresh | Photograph it from all sides and ask for an assessment |
| Tar balls | Black or dark rounded lumps | Sticky, oily, hard or greasy | Petroleum, oil, chemical | Avoid direct handling; photograph only |
| Fatbergs and sewage debris | Black, grey, greenish or greasy balls | Soft inside, greasy, crumbly, unpleasant | Sewage, rancid oil, waste-like | Avoid direct handling; do not cut or heat |
| Pumice | Pale, grey, porous stone-like object | Very light, rough, porous, stone-like | Little to no ambergris-like scent | Compare texture and weight; photograph if unsure |
| Palm oil and vegetable fat | Waxy white, yellow, beige or pale lump | Soft, greasy, fatty, melts easily | Vegetable oil, rancid fat, soap-like | Do not assume it is ambergris; photograph if unsure |
| Kelp and seaweed | Dark, rubbery, dried marine material | Fibrous, plant-like, breaks apart | Seaweed, marine rot | Check for fibres and plant structure |
| Blubber and animal fat | Pale, fleshy, fatty mass | Greasy, soft, decomposing | Rancid, rotten, animal-like | Avoid handling; do not store it indoors |
| Wax and paraffin | White, cream, yellow or grey waxy lump | Waxy, smooth, melts easily | Candle-like, chemical, faint | Hot needle reactions can mislead; use photos |