Alum - Potash alum. Potash alum, K2SO4·Al2(SO4)3·24H2O, crystallizes in regular octahedra and is very soluble in water. The solution reddens litmus and is an astringent. When heated to nearly a red heat it gives a porous, friable mass which is known as "burnt alum." It fuses at 92 °C in its own water of crystallization. "Neutral alum" is obtained by the addition of as much sodium carbonate to a solution of alum as will begin to cause the separat ...

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Alum, Alum - Alchemical and later discoveries and uses, Alum - Pliny's writings, Alum - Alum from alunite, Alum - Alum from clays or bauxite, Alum - Types of alum, Alum - Potash alum, Alum - Soda alum, Alum - Chrome alum, Alum - Ammonium alum, Alum - Alum solubility, Alum - Uses

Read more here: » Alum: Encyclopedia II - Alum - Types of alum

Alum, in chemistry, is a term given to the crystallized double sulfates of the typical formula M+2SO4·M3+2(SO4)3·24H2O, where M+ is the sign of an alkali metal (lithium, sodium, potassium, rubidium, or caesium), and M3+ denotes one of the trivalent metals (typically aluminium, chromium, or iron (III)). The ammonium ion (NH4+) also occurs in the M+ position. These salts are employed in ...

Including:

• Alum - Alchemical and later discoveries and uses
• Alum - Pliny's writings
• Alum - Alum from alunite
• Alum - Alum from clays or bauxite
• Alum - Types of alum
• Alum - Soda alum
• Alum - Chrome alum
• Alum - Ammonium alum
• Alum - Alum solubility
• Alum - Uses

Read more here: » Alum: Encyclopedia - Alum

The word "alumen," which we translate "alum," occurs in Pliny's Natural History. In the 15th chapter of his 35th book he gives a detailed description of it. By comparing this with the account of stupteria given by Dioscorides in the 123rd chapter of his 5th book, it is obvious that the two are identical. Pliny informs us that alumen was found naturally in the earth. He calls it salsugoterrae. Different substances were distinguished by the name of "alumen"; but they were all characterized by a certain degree of astringency, and ...

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Alum, Alum - Alchemical and later discoveries and uses, Alum - Pliny's writings, Alum - Alum from alunite, Alum - Alum from clays or bauxite, Alum - Types of alum, Alum - Potash alum, Alum - Soda alum, Alum - Chrome alum, Alum - Ammonium alum, Alum - Alum solubility, Alum - Uses

Read more here: » Alum: Encyclopedia II - Alum - Pliny's writings

Shaving alum is a powdered form of alum used as an astringent to prevent bleeding from small shaving cuts. The styptic pencils sold for this purpose contain aluminium sulfate or potassium aluminium sulfate. Similar products are also used on animals to prevent bleeding after nail-clipping. Crystal deodorant: Alum was used in the past as a natural underarm deodorant in Mexico, Thailand, and the Far East and in the Philippines where it is called Tawas. Man-Made Egg: Alum can be used in combination with several other chemicals to crea ...

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Alum, Alum - Alchemical and later discoveries and uses, Alum - Pliny's writings, Alum - Alum from alunite, Alum - Alum from clays or bauxite, Alum - Types of alum, Alum - Potash alum, Alum - Soda alum, Alum - Chrome alum, Alum - Ammonium alum, Alum - Alum solubility, Alum - Uses

Read more here: » Alum: Encyclopedia II - Alum - Uses

The presence of sulfuric acid in potash alum was known to the alchemists. J. H. Pott and A. S. Marggraf demonstrated that alumina was another constituent. Pott in his Lithogeognosia showed that the precipitate obtained when an alkali is poured into a solution of alum is quite different from lime and chalk, with which it had been confounded by G.E. Stahl. Marggraf showed that alumina is one of the constituents of alum, but that this earth possesses peculiar properties, and is one of the ingredients in common clay. He also showed that c ...

See also:

Alum, Alum - Alchemical and later discoveries and uses, Alum - Pliny's writings, Alum - Alum from alunite, Alum - Alum from clays or bauxite, Alum - Types of alum, Alum - Potash alum, Alum - Soda alum, Alum - Chrome alum, Alum - Ammonium alum, Alum - Alum solubility, Alum - Uses

Read more here: » Alum: Encyclopedia II - Alum - Alchemical and later discoveries and uses