What is alum

Introduction: alum is the crystal of mineral alum stone So, what is alum? Let the small editor of Baibai safety net lead you to learn more about it! Alum is commonly used in our daily life, the efficacy and effect of alum powder is very obvious What is alum? Baibai safety net and you to understand it! Aluminum potassium sulfate, also known as alum, alum, potassium alum, potassium alum It is a double salt of potassium sulfate and aluminum sulfate containing crystal water Colorless cubic crystal, usually octahedral in appearance, or agglomerated with cube and rhombus dodecahedron, sometimes attached to the wall of the container in the shape of hexagonal plate, belongs to A-type alum complex salt, with glass luster Density 1.757g/cm3, melting point 92.5 ℃ At 64.5 ℃, 9 molecules of crystal water are lost, and at 200 ℃, 12 molecules of crystal water are lost They are soluble in water and insoluble in ethanol Alum is sour, cold and poisonous Therefore, it has antibacterial and astringent effects and can be used as traditional Chinese medicine Alum can also be used to prepare aluminum salt, fermentation powder, paint, tanning material, clarifier, mordant, papermaking, waterproof agent, etc it can also be used as food additive In our daily life, it is often used for water purification and food expansion agent, such as fried sesame balls and fried dough sticks Aluminum potassium sulfate dodecahydrate can also be called aluminum potassium sulfate dodecahydrate The above is the answer about what alum is provided by Baibai safety net I hope my article will let you have a clearer understanding of this problem! To learn more about food safety, please pay more attention to Baibai safety Internet bar! Editor in charge: Wang Xiujuan