Alum, or potash alum, is a type of crystal that appears in a translucent or opaque white form. Also known as phèn chua in Vietnamese, this substance has a variety of practical applications in daily life, including water purification and personal hygiene.
## What is Phèn Chua?
Phèn chua is a type of alum, specifically potassium aluminum sulfate, which appears as translucent or opaque white crystals. This substance is soluble in water and can become porous when heated to high temperatures.
Phèn chua appears as translucent or opaque white crystals.
Uses of Phèn Chua
Phèn chua has a multitude of applications in everyday life and can also be used for various home remedies.
– Water Purification
Before the availability of treated water from centralized systems, phèn chua was commonly used to purify water for drinking and household use. Crushed phèn chua is mixed with water at a ratio of 1 gram per 20 liters, stirred until dissolved, and allowed to settle for about 30 minutes. The clear water is then carefully decanted from the top, leaving the sediment at the bottom.
Phèn chua contains aluminum, which is effective in neutralizing body odors. It can be applied directly to the skin, particularly in areas prone to sweating, such as the underarms and feet, to reduce odor.
Phèn chua has a variety of practical uses in daily life.
– Oral Hygiene and Bad Breath
Due to its antiseptic and deodorizing properties, phèn chua can be used as a mouthwash when mixed with water. Regular rinsing with this solution helps eliminate bacteria and improve oral hygiene, reducing bad breath.
– Cleaning Pork Organs and Stomach
To clean and deodorize pork offal, such as intestines and stomach, a teaspoon of powdered phèn chua can be mixed with the organs and rubbed together to remove slime and impurities. Afterward, rinse the ingredients thoroughly with clean water before cooking.
– Preserving Fresh Eggs
A 5% phèn chua solution can be used to extend the freshness of eggs. Soak the eggs in this solution for about 15 minutes, then remove and thoroughly dry them. This method helps maintain the quality and freshness of the eggs for a longer period.
– Color Retention for Clothes
To prevent color fading in new clothes, soak them in a solution of phèn chua and water (or alternatively use vinegar or salt) for a few hours before washing. This treatment helps fix the dye to the fabric, ensuring the colors remain vibrant for longer.
– Shoe Deodorizer
Crush phèn chua into small pieces and place them in a small cloth bag. Tie it securely and place it inside your shoes to absorb moisture and eliminate unpleasant odors.
– Preventing Mold on Bamboo and Rattan Items
To inhibit mold growth on bamboo and rattan items, soak them in a 40% phèn chua solution for about 5 minutes, then remove and air-dry them thoroughly.
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