Casse
Casse is a cloudiness or precipitate which sometimes appears in certain wines because of some natural imbalance. Copper casse and iron casse are two that have plagued the wine industry off and on for decades. Both were identified as coming from traces of copper and/or iron picked up by the wine from brass fittings or steel pumps and tanks during processing. Both problems have been almost completely cured by the use of stainless steel tanks and equipment.