The useful answer starts with timing and pathway
Efflorescence records dissolved salts carried by moisture. The deposit alone does not identify the moisture source or structural condition.
Best first comparison
Document when the symptom begins, what condition preceded it and where the first visible or measurable change occurs.
Before deciding on a repair
Compare at least one credible alternative cause and choose a check that can separate the two without creating new damage.
Observe→Compare triggers→Repair source→Verify outcome
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