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Butter is a dairy product made by churning fresh or fermented cream or milk. It is generally used as a spread and a condiment, as well as in cooking applications, such as baking, sauce making, and pan frying. Butter consists of butterfat, water and milk proteins. Most frequently made from cows’ milk, butter can also be manufactured from the milk of other mammals, including sheep, goats, buffalo, and yaks. Salt, flavorings and preservatives are sometimes added to butter. Rendering butter produces clarified butter or ghee, which is almost entirely butterfat. Butter is a water-in-oil emulsion resulting from an inversion of the cream, an oil-in-water emulsion; the milk proteins are the emulsifiers. Butter remains a solid when refrigerated, but softens to a spreadable consistency at room temperature, and melts to a thin liquid consistency at 32–35 °C (90–95 °F). The density of butter is 911 g/L (56.9 lb/ft). It generally has a pale yellow color, but varies from deep yellow to nearly white. Its unmodified color is dependent on the animals’ feed and is commonly manipulated with food colorings in the commercial manufacturing process, most commonly annatto or carotene. 
Butter is often served for spreading on bread with a butter knife. Egg white is the common name for the clear liquid (also called the albumen or the glair/glaire) contained within an egg. In chickens it is formed from the layers of secretions of the anterior section of the hen’s oviduct during the passage of the egg. It forms around either fertilized or unfertilized egg yolks. It consists mainly of about 10% proteins dissolved in water. Its primary natural purpose is to protect the egg yolk and provide additional nutrition for the growth of the embryo, as it is rich in proteins, though it contains almost no fat, unlike the egg yolk, which has a high fat value. There are many culinary and nonculinary uses for egg whites, for example, mousse 
An egg yolk surrounded by the egg white.
From Wikipedia, the free encyclopedia : Wholesale dairy products, edible oils and fats, eggs |
