Base metals close lower in overnight session; tin drops 2.35%

Tin's outsized drop and alumina's decline stand out in a broadly softer session, suggesting the weakness is concentrated in specific industrial chains rather than a uniform macro move. The breadth of the declines across both international and Shanghai contracts points to shared pressure rather than isolated local factors. Whether tin and alumina keep leading to the downside, or the softness broadens further across the complex, is the open question worth tracking.