Alum
The alum (of the Greek als, alos : salt) is a double Sulfate of Aluminum and Potassium. One employs it inter alia like corrosive for the dyeing of the fabric. Extract in various areas, in particular close to Phocée, in Minor Asia.
The alum is a disinfectant and astringent. It is thus used as deodorant (alum stone): it controls perspiration by tightening the pores of the skin and fight against the odors. It is also used as after-shave to alleviate the fire of the razor: its astringent action makes it possible to avoid the effects of incarnated hairs and its coagulating action avoids the bleedings after the small cuts of shaving. It in addition is used as coagulant in the treatment of drinking water.
The alum stone is used humidified with cool water while slowly passing it on the zones to be shaved before or after shaving.
Chemistry
The alum is a salt (sulfate doubles) made up of sulfate of aluminum, potassium or D `ammonium and water of crystallization. Aluminum, in the form of hydroxide or oxide (alumina), is the constituent main part of clays. In the case of the formation of alum: Aluminum hydroxide (bases) + hydrogen sulfate (acid sulphuric) gives aluminum sulfate (salt) + water Hydroxyde of potassium (bases) + hydrogen sulfate (acid sulphuric) gives potassium sulfate (salt) + water One obtains 2 salts thus making it possible to form double potassium and aluminum sulfate, i.e. the alum.
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