Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over a period of time.

It is usually a basic copper carbonate, but near the sea will be a basic copper chloride.   If acetic acid is present at the time of weathering, it may consist of copper acetate.

Our range of copper light fittings, when exposed to the elements over time, may take on this pigment.  Some locations may take many, many years to bring out the verdigris and others will have a more rapid effect.  It is possible to speed up the process but applying an aging agent available at some hardware shops and paint shops.  We have even seen it sped up with the application of yogurt!  Alternatively, to slow the process regular maintenance/cleaning will keep the verdigris at bay.

This copper wall wedge has been mounted in a coastal
an environment for 18 months without any aging agents and no maintenance.