Shanghai base metals close mixed: copper up 0.53%, nickel up 1.47%, tin up 1.70%

The dispersion matters more than the headline: nickel and tin led gains while aluminum, lead and aluminum alloy slipped, pointing to metal-specific drivers rather than a single macro impulse across the complex. Stainless steel's marginal move despite nickel's strength suggests the stainless chain is not simply tracking its key input. Whether nickel and tin extend their outperformance against the rest of the complex is the open question to watch.