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There are better products for cold sores than alum. However, you can buy alum in the spice department in most grocery stores.
Alum powder is called "Padikaram" in Tamil.
It is alum-based baking powder.
Alum can be purchased in a one pound package. It is a granulated powder that is used in pickling recipes, papermaking, dying and coloration.
At any grocery store usually in the spice section because it is mostly sold in powder form.
To make an astringent out of alum powder, mix a small amount of alum powder with water to create a paste or solution. Apply the mixture to the skin using a cotton ball, and let it sit for a few minutes before rinsing off. Alum powder has astringent properties that can help tighten the skin and reduce oiliness.
Alum powder refers to potassium alum or ammonium alum, while aluminum sulfate is a different compound. Alum powder is a naturally occurring mineral with astringent properties used for various purposes including pickling and medicinal uses. Aluminium sulfate is a synthetic compound commonly used in water treatment, paper production, and as a mordant in dyeing.
Aluminum-based baking powder.
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