Alum Potassium SulphateMetal Mordant Alum is the most common metal found in the earths crust. Alum Potassium or potash alum is a metal mordant for textiles. It is a hydrated double sulphate of potassium and aluminum. Also referred to as just Alum. It helps in making the colour fast over the textiles as well as slightly brighter, hence known as Sunny Mordant!
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