Which one of the following can work as a mordant? (a) \( \mathrm{NaCl} \) (b) \( \mathrm{K}_{2} ...

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Which one of the following can work as a mordant?
(a) \( \mathrm{NaCl} \)
(b) \( \mathrm{K}_{2} \mathrm{SO}_{4} \)
(c) Alum
(d) Plaster of pairs
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