Alum Rock is a colorless and odorless natural mineral salt used as an alternative to Aluminum Chloride and Chlorohydrate. It occurs naturally in various minerals. Potassium alum, for example, is found in the minerals kaolinite, alunite, and leucite, which can be treated with sulfuric acid to obtain crystals of the alum.

Traditional Chinese medicine used alum rock for hundreds of years due to its antimicrobial properties. It is also used as a topical astringent and an antiseptic for wounds.

Potassium Alum powder form is used to remedy bleeding gums and mouth ulcers.

Potassium Alum is also known as Aluminum Potassium Sulfate dodecahydrate.

DEODORANT & ANTIPERSPIRANT

Alum rocks act as an effective deodorant and partial antiperspirant.

Alum rock has antibacterial action to prevent the malodor-producing axillary bacterial flora from multiplying. Moreover, it forms a porous barrier on the skin to prevent perspiring that doesn't clog the pores.

ANTISEPTIC & ASTRINGENT PROPERTIES

Alum rock has different traditional applications due to its antiseptic, and astringent properties.

The antiseptic properties of the alum rock offer protection against disease-causing microorganisms, while the astringent properties help reduce inflammation, shrink or constrict the body tissue to stop bleeding and accelerate healing.

• Aftershave: Alum rock is used after shaving due to its styptic properties to reduce bleeding associated with minor nicks and cuts. It also soothes the skin from razor bumps, burns and redness and prevents the spread of microorganisms.
• Canker sore: Alum rock is used to shrink tissues and dry out mouth sores due to its strong healing activity.
• Bleeding Gum: Due to its styptic properties that tighten the tissue to stop bleeding. Alum rock can be applied to the gum to stop bleeding.
• Vagina: Alum rock can tighten up the vaginal wall and prevent vaginal infection.
• Reduces Acne Lesions: Alum causes cells to shrink, tightens pores, removes excess oil and stops or slows down the bacterial growth from the skin making it effective for the reduction of acne scars and pigmentation marks.

Potassium alum is a safe ingredient since it consists of large particles (about 480 Daltons) that are too large to be absorbed through the skin.

https://pubchem.ncbi.nlm.nih.gov/compound/Aluminum-potassium-sulfate

https://www.researchgate.net/publication/305116293_Potassium_Aluminium_Sulphate_Alum_Inhibits_Growth_of_Human_Axillary_Malodor-Producing_Skin_Flora_in_Vitro

https://www.researchgate.net/publication/269463918_Formulation_and_evaluation_of_potash_alum_as_deodorant_lotion_and_after_shaving_astringent_as_cream_and_gel

https://crystalspring.co.uk/blogs/under-our-skin/why-potassium-alum-is-your-armpit-s-best-pal

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5062179/

https://pubmed.ncbi.nlm.nih.gov/18038277/

https://actascientific.com/ASMI/pdf/ASMI-03-0553.pdf