The Natural Patina of the
Wind Sculptures and Garden Sculptures
The patina is a top layer on copper and copper alloys which gradually forms on the surface of the wind sculptures and garden sculptures. It’s resistant to weather, has a strong bonding, it’s durable and non-toxic. By the formation of this natural protective layer the corrosion of the wind sculptures and garden sculptures is practically stopped. The best examples for this are the copper roofs of historical buildings which often last for centuries. The forming patina is an intended advancement of the surface of the wind sculptures and garden sculptures.
Colloquial the green patina of these roofs is often called verdigris. This designation is not correct. Verdigris originates only from the chemical reaction of copper materials with acetic acid which is not found in the atmosphere. In contrast to the natural protective layer of the patina, verdigris is soluble in water and shows a pungent green tone.
The color of the patina on the wind sculptures and garden sculptures is regional slightly different according to the atmospheric conditions.
The most important factors of influence for the forming of the patina on the surface of the wind sculptures and garden sculptures are the composition of the atmosphere and the humidity. Rain, snow, frost, dew, fog, etc. Decisively for a quick forming patina is in particular a larger amount of rainfall, high average temperatures, as well as the adjustment of the wind sculptures and garden sculptures towards the main weather direction.
Of vital importance for the speed which the patina on the wind sculptures and garden sculptures forms is the pollution of the atmosphere. The firmness state and the purity degree of the copper is of no importance.