Used as an astringent in dermatology to treat skin irritations, rashes, and minor wounds. Helps reduce swelling and oozing by tightening skin tissues. Commonly found in solutions or wet dressings for conditions like eczema, poison ivy, and insect bites. Also utilized in some ear and eye preparations for its soothing and drying effects.

In industrial settings, serves as a mordant in dyeing processes to help fix colors on fabrics, particularly for wool. Used in wastewater treatment to precipitate impurities and clarify water. Occasionally employed in the leather industry to soften and enhance the durability of tanned leather.