Whole cumin seeds are small, elongated, boat-shaped seeds that resemble caraway seeds but are slightly larger. They typically measure around 4-5 mm in length and have a distinct curved appearance. The seeds are brown in color, with variations from light to dark brown.To maintain their freshness, whole cumin seeds should be stored in an airtight container in a cool, dark place, away from direct sunlight and moisture. Proper storage can help preserve their flavor and aroma for an extended period.