How to Grow Large Alum Crystals by Crystallization
Scrap Aluminium Foil to Potash Alum Procedure Video
Potassium Alum - A Natural Mordant
Update on the Potassium Alum car battery - Update zur Kalium Alaun Auto Batterie
Mineral deodorant Finesse Crystal Style - Potassium Alum Crystals made in Italy
Growing Potassium Aluminum Sulfate Crystals
Potassium Alum Pyramid - Stargate Magasine - Healing with emotional music
potassium alum Demo
Potassium Alum, China
How to Pronounce Potassium-alum
5.3" Hot NeonPink POTASSIUM ALUM Pineapple Shaped Crystal Cluster-China for sale
Vivid pink 5.3" Fantastically crystallized POTASSIUM ALUM pineapple
HOW TO AFTER SHAVE ROUTINE SHAVING TUTORIAL by Geofatboy ShaveNation.com Alum Block Stick
Preparation and Analysis of Alum
Pyramid Alum Crystal 2008-08-16
Complex Ions: Making Chrom Alum Crystals
Alum Pyramid Seed
alum growing crystal lab 2
Pyramid alum growing crystal - Cristal d'alun pyramidal
Alum from Soda Cans
alum growing crystal lab - labo pour cristaux d'alun
The Alum Experiment
aluminum sulfate, aluminum ammonium sulphate, aluminum potassium sulphate----manufacturer
How To Treat Silty River Water With "Alum"
alum octahedron crystal -- cristal d'alun en octaèdre
Alum Crystal Prism
CHEM 111 Lab: Alum Prelab
Alum Single Crystal
Insect inside Alum Pyramid Crystal
DIY: Natural Deodorant Spray
Guide: Hvordan funker en Alum stick?
Alum history, tutorial, and opinions as well as suggestions - from the W.S.Review
Кристалл свежести - безопасный натуральный дезодорант из квасцов
Quaid-e-Azam public school Potash alum
Consigli Cosmetici: Acqua di Bellezza Caudalie
Крем после бритья - Kamila Secrets Выпуск 57
Why do concealers crease & not last?! || KUWR
aluminium dissolving in potassium hydroxide solution
Описание природного дезодоранта - Алунита
Learn how to grow a beautiful single crystal of salt at home!
used potassium sulfate plant equipments for sale
Desodorantes Naturales " Mi Experiencia"
octahedron in a cube - POVRAY animation
Using a Deodorant Stone
♥ Mes Soins Grossesse et Post-Accouchement ♥
TOUT savoir sur la pierre d'alun en cosmetique
Crystal Deodorant Best Seller - thanksgiving day
Crystal Growing by Thames & Kosmos
3 prodotti a confronto: deodoranti per ascelle delicate
From Wikipedia, the free encyclopedia
This article needs additional citations for . verification (March 2010)
Potassium alum, potash alum, tawas, or potassium aluminum sulfate is a chemical compound: the potassium double sulfate of aluminium. Its chemical formula is KAl(SO 4) 2 and it is commonly found in its dodecahydrate form as KAl(SO 4) 2.12(H 2O). Alum is the common name for this chemical compound, given the nomenclature of potassium aluminum sulfate dodecahydrate. It is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder. It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving. [4 ]
Characteristics [ edit ]
potassium alum crystal with unequal distribution of the face area.
Potassium alum crystallizes in regular
octahedra with flattened corners, 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 (198 °F) 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 separation of alumina.
Mineral form and occurrence [ edit ]
Potassium alum or
alum-(K) is a naturally occurring sulfate mineral which typically occurs as encrustations on rocks in areas of weathering and oxidation of sulfide minerals and potassium-bearing minerals. In the past, alum was obtained from alunite, a mineral mined from sulfur-containing volcanic sediments source. Alunite is an associate and likely potassium and aluminium source. [5 ] [3 ] It has been reported at [6 ] Vesuvius, Italy, east of Springsure, Queensland, Alum Cave, Tennessee, Alum Gulch, Santa Cruz County, Arizona and the Philippine island of Cebu. A related mineral is , a fibrous mineral with formula KAl(SO kalinite 4) 2·12(H 2O). [7 ]
Chemical [ edit ]
in tanning of leather to prepare the hide
mordant for dyes in the clarifying of turbid liquids, including post-storm treatment of lakes to precipitate contaminants
[8 ] as a fire retardant in
textile products (historically) as a hardener for photographic emulsions (films and papers), usually as part of the
fixer. Modern alternatives are superior.
Medicinal [ edit ]
Culinary [ edit ]
As an additive to
baking powder to provide a second leavening phase at high temperatures.
Traditional [ edit ]
Toxicology and safety [ edit ]
Deodorant crystals containing synthetically made potassium alum are a weak
irritant to the skin. [10 ]
See also [ edit ]
References [ edit ]
^ International Union of Pure and Applied Chemistry (2005). (IUPAC Recommendations 2005). Cambridge (UK): Nomenclature of Inorganic Chemistry RSC– IUPAC. ISBN 0-85404-438-8. Electronic version.
^ "Aluminium potassium sulfate dodecahydrate". ChemExper . Retrieved 2013-04-19.
^ a b "Alum-(K) Mineral Data". Mineralogy Database . Retrieved 2013-04-19.
^ a b Helmenstine, Anne Marie. "What is Alum?". About.com . Retrieved 2013-04-19.
^ Bottomley (2010) p. 35
^ "Alum-(K) mineral data and informaton". MinDat . Retrieved 2013-04-19.
^ "Kalinite Mineral Data". MinDat . Retrieved 2013-04-19.
^ http://tcm.health-info.org/Herbology.Materia.Medica/mingfan-properties.htm Uses of Alum in Traditional Chinese Medicine
^ Gallego H, Lewis EJ, Crutchfield CE 3rd (July 1999). "Crystal deodorant dermatitis: irritant dermatitis to alum-containing deodorant". Cutis 64 (1): 65–6. PMID 10431678.
Further reading [ edit ]
Bottomley, L.; Bottomley, L.A. (2010). School of Chemistry & Bichemistry, Georgia Institute of Technology, Chemistry 1310: Laboratory Manual. Plymouth, MI: Hayden-McNeil Publishing. ISBN 978-0-7380-3819-3.
External links [ edit ]