Brown grease

Such feedstocks include non-refined virgin oils, used cooking oils that commonly have an FFA level of >6% and tallow (6%), yellow grease obtained from rendered animal fat (up to 15% in FFAs) and brown grease obtained mainly from traps installed in commercial, municipal or industrial sewage facilities (>15%). The production of... 

In biodiesel preparation, vegetable oils and animal fats are typically employed as biomass feedstocks, but waste greases such as yellow grease and brown grease can also be used. Thus, biodiesel synthesis provides a means for... 

Used cooking oil/yellow grease is the used-up fat and oil obtained from the food industries, canteens, and restaurants. It mainly contains vegetable oils and less animal fat, which can be used in biofuel production. Brown grease/trap grease, a water/oil emulsion with... 

A little bit of iron powder causes brown black flecks and copper powder green/blue ones. Wood and other organic particles result in dents, holes and craters and a grease stain on the sherd surface in a dry spot. 

Mahogany acids oil-soluble sulfonic acids formed by the action of sulfuric acid on petroleum distillates. They may be converted to their sodium soaps (mahogany soaps) and extracted from the oil with alcohol for use in the manufacture of soluble oils, rust preventives, and special greases. The calcium and barium soaps of these acids are used as detergent additives in motor oils see also Brown acids and Sulfonic acids. 

T. T. Adams, J. Walsh, M. Brown, J. Goodmm, J. Sellers, and K. Das, A Demonstration of Fat and Grease as an Industrial Boiler Fuel, Engineering Outreach Service, University of Georgia, Athens, GA. (2002). Available http //www.engr.uga.edu/service/outreach/ hiofuel.htm. 

---