If you dream of alum, it signals that carefully constructed plans may fall apart before they reach fruition — the effort you've put in may not yield the results you anticipated.
If you taste alum in your dream, it reflects a quiet guilt simmering beneath the surface, a hidden awareness that your actions may have caused harm to someone who didn't deserve it.
If you dream of large amounts of alum, it may point to unease around romantic commitment — a fear that love will fade or that a partnership will fail to deliver the emotional fulfillment you long for.