In the art world, it is fostered by an incessant rain of numbers in the media whenever an art star comes to its attention. Graffiti Artists Turn on Banksy: The Rise of Art Hate Anthony Haden-Guest August 6, 2014
For the music genre, see Sludge metal. Sludge. Sludge is a semi-solid slurry and can be produced as sewage sludge from wastewater treatment processes or as a settled suspension obtained from conventional drinking water treatment and numerous other industrial processes.
Biliary sludge is a mixture of particulate matter and mucous that forms in bile. (Bile is the yellow-brown fluid that drains from the liver into the gallbladder where it is stored and concentrated. After meals the gallbladder contracts, squirting the bile through the common bile duct into the duodenum, where it helps to digest the fat in meals.) The composition of biliary sludge varies. The most common particulate matter in biliary sludge is cholesterol crystals and calcium salts.