A closer look at the surface of EverGreen™.

Uniformity of appearance is definitely NOT a characteristic of this product. On the contrary, EverGreen Pre-patinated Sheet copper is a celebration of copper's character. The lack of consistency is precisely what gives it its natural beauty and richness of texture, and it can all be attributed to the tiniest of details: the patina crystals which populate the surface. Two key factors dictate the crystals' appearance: maturity and density.

Crystals mature gradually

When first shipped, immature crystals often predominate. The appearance is typically mottled yellow or yellow/green with traces of blue or brown, along with small, chalky white spots and/or brown speckles. As the crystals mature they begin to convert to copper-chloride-hydroxides, and their appearance changes to predominantly blue or blue/green. Eventually, all crystals will "hydrate" toward these shades, and the mature patina will have become thicker, stronger and even more durable.

Density affects appearance

Although Revere tightly controls conditions under which EverGreen is manufactured, the number of crystals in an area varies within and between sheets. This can produce slightly different shades or hues, depending on how much copper is visible. The variations in appearance are not flaws, but are actually a sign of quality. Such irregularities are particularly evident when EverGreen is new, but as patina matures and the bare copper oxidizes, color differences soften, blend and become less noticeable.

Moisture is critical

Available moisture and temperature determine the speed at which EverGreen matures. It is a chemical reaction that occurs faster in warm, humid environments. In a totally dry environment the reaction will not occur. A uniform appearance may be achieved within 12 months, but no one can predict how long will be required for a given installation. Everything else being equal, vertical walls weather slower than sloping roofs, and reverse slopes such as soffits change slower still.