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Glycerin soap can also be produced without remelting soap through directly cooking raw home-made soap. [3] Modern clear glycerin soaps bases are produced by combining various glycerol and polyols with soap and other surfactants in a manner similar to traditional glycerin soap-making methods. These modern clear soaps have the benefit of being ...
According to both Neander, and Tomkiewicz and Semków, "soap", made from human cadavers, came into existence at the Danzig institute, [25] it was not related to the alleged Holocaust-related crimes of "harvesting" Jews or Poles for soap-making purposes, because the connection between "the Holocaust" on one side and the "Danzig soap" on the ...
The meltable base is usually naturally rich in glycerine, a by-product of saponification that has humectant and emollient properties, whereas commercial soap bars have often had this component removed. As with the rebatching method, it can be considered a misnomer to refer to the melt and pour process as soap making. The process has much in ...
Hard toilet soap with a pleasant smell was produced in the Middle East during the Islamic Golden Age, when soap-making became an established industry. Recipes for soap-making are described by Muhammad ibn Zakariya al-Razi (c. 865–925), who also gave a recipe for producing glycerine from olive oil.
The original blocks of soap were brown. Gossage called in James Hargreaves, (1834–1915) a local consultant chemist. After many sleepless nights they eventually discovered a way to produce a whitish soap with the mottle (particles of ultra marine) distributed evenly through it, producing a soap that looked rather like a blue cheese.
To separate glycerin from the soap, the pasty boiling mass is treated with brine (NaCl solution). Contents of the kettle salt out (separate) into an upper layer that is a curdy mass of impure soap and a lower layer that consists of an aqueous salt solution with the glycerin dissolved in it.
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The product of the reaction is glycerol and salts of fatty acids. Fatty acids in the soap emulsify the oils in dirt, enabling the removal of oily dirt with water. Partial glycerides are esters of glycerol with fatty acids, where not all the hydroxyl groups are esterified. Since some of their hydroxyl groups are free their molecules are polar.