What’s the difference between brown and yellow grease?
The terms “Yellow” and “Brown” grease are generic industry terms that refer to grades of partially rendered fats, oils, and greases based on their free fatty acid (FFA) content. Yellow grease has less than 15% FFA. For example, most used fryer oil is yellow grease. Brown grease has more than 15% FFA. For example, trap grease and clarifier scum are brown greases.
