A common mordant used in indigo dye is ............
A.
Ash
B.
Alum
C.
Chlorine
D.
Sulphur
Correct Answer: Option B
Explanation
Alum is the most commonly used mordant since it's easy to find, use, inexpensive, and less toxic than other options. It improves the wash-fastness of natural dyes, doesn’t change the basic color of the fabric, and keeps dye colors clear.
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