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Trace tea staining to embedded particles, heat tint, abrasive transfer and residue trapped in finish lines or crevices.

Pickling removes scale and altered surface layers; passivation addresses surface condition after cleaning, with different controls and risks.

Build maintenance around exposure, salt retention, crevices, dissimilar metals, fastener condition and finish appearance.

Remove grinding dust, weld residue, cement deposits and carbon-steel contamination before handover to prevent avoidable staining.

Buyers need a traceable process record tied to the actual lot, not a generic statement that 316 components were passivated.

Investigate grade, finish, crevices, contamination, drainage and cleaning records before treating every coastal stain as material failure.