Silesian Steelworks Gray distills Upper Silesia's coal-and-steel heartland — the Katowice, Chorzów and Zabrze mills and the riveted winding towers of the Prezydent and Anna mines. The reading is grimy charcoal steel near-black, with rivet shadow, slag grays and drifting smoke haze.

Surfaces are heavy riveted plate, not polished metal. A single documented oxide-red — the rust and mine-paint of familok housing — is the only color, used sparingly like a stencilled hazard mark over soot-dark ground.