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30 cladding & facades; doors, windows & conservatories The most common compound found in natu-


ral patinas all over the world is the copper sulphate mineral brochantite and factory-applied patinas have been developed with properties and colours based on the same mineralogy. Brochan- tite is a light blue colour but in many locations impurities and other components in the air add a yellow tint to give the naturally developed patina a green hue and this can be replicated with pre-patination processes as well. In marine climates, the natural copper patina contains some copper chloride giving it more of a blue colour and this can be emulated using 100 per cent brochantite.


Copper Alloys


Of course, copper alloys have also been used throughout history and coils or sheets of Bronze and Brass – which can also be pre-weathered – are available for architectural applications. In addition, a recently developed alloy of copper with aluminium and zinc gives a rich golden through-colour. Its surface retains the golden through-colour and simply loses some of its sheen, as the oxide layer thickens with exposure to the atmosphere to give a protective matt fin- ish. This golden alloy behaves differently to other copper products over time and does not develop a blue or green patina.


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