Why is meat pink after its been smoked?
Most barbecuers use either wood chips or logs to generate smoke when cooking. Wood contains large amounts of nitrogen (N). During burning the nitrogen in the logs combines with oxygen (O) in the air to form nitrogen dioxide (NO2). Nitrogen dioxide is highly water-soluble. The pink ring is created when NO2 is absorbed into the moist meat surface and reacts to form nitrous acid. The nitrous acid then diffuses inward creating a pink ring via the classic meat curing reaction of sodium nitrite. The end result is a “smoke ring” that has the pink color of cured meat. Smoke ring also frequently develops in smokehouses and cookers that are gas-fired because NO2 is a combustion by-product when natural gas or propane is burned.
