But blow too much air into it and the asphalt becomes over-oxidized making it brittle from ... asphalt shingles was a large cupola with a copper roof. Instantly I theorized that copper ions ...

one of about a dozen color stops on an odyssey of oxidation that, in 25 years or so, is destined to end in a soft-green patina. Workers have installed the solid copper roof on three of the ...

OTTAWA -- Oxidized copper is no longer the only cause of green rooftops around Parliament Hill. The parliamentary precinct got its first live green roof last week. Hundreds of sprigs of stonecrop ...

Copper sheets and strips go through a carefully controlled pre-oxidization and pre-patination process to immediately provide the same brown oxidized and green or blue patinated surface that would ...

Copper sheets and strips go through a carefully controlled pre-oxidization and pre-patination process to immediately provide the same brown oxidized and green or blue patinated surface that would ...