Marseille soap

Among the nuclear soaps and soaps are usually sodium salts of fatty acids. They have a white to brownish color and a fatty acid content of 72-75 %. They are usually obtained from fats lower quality. Curd soap form the basis for preparations which are often called fine soaps and are treated with moisturizing additives, perfumes and dyes.

Naming

The name " pure soap " is based on the method of production of soaps, in which, from a boiling in plenty of water mass by the addition of common salt ( sodium chloride) the soap core is deposited, the more solid than floating on top mass, so " earthy " is.

Production

By saponification of fats are decomposed with sodium hydroxide in the sodium salts of fatty acids and glycerol. The resulting soap mass is called neat soap or Leimseife and is the precursor for the production of soap. After the addition of sodium chloride ( salting out ) of the soap floating on core and is separated. The water-soluble glycerol and unwanted impurities from the fats remain in the solution. (See also soap. )

Properties and Uses

The costs incurred in the production of salts of fatty acids are the real and soap have a purifying effect, since they possess the characteristics of a surfactant. With the help of soap can thus many, not really into water -soluble substances, such as fats and mineral oils, are rinsed with water. Practically core soaps or preparations are based on core soaps only be used for cleaning hands as they lead to defatting of the skin and an alkaline reaction. In detergents, soaps only play the subordinate role as defoamers due to the formation of calcium soaps. Sometimes aqueous soap solutions are used for pest control in crops, eg against thrips and aphids. Curd soap is also used for shaping and creating dreadlocks. When cleaning brushes (especially in oil painting ) the core soap ensures a significantly longer shelf life.