The corrosion inhibition effect of verdigris is produced by the specific distribution and concentration of alloying elements in it. When affected by the weather, the patina continuously develops and regenerates to create a protective layer. And if ordinary steel is rusted, the rust is porous, and there are small holes on the surface that are invisible to the naked eye. This rust does not seal the steel surface, so the rusting process never stops, so it tends to flake off. With weathering steel, the resulting patina is much less porous. It feels very smooth
