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Freedom Gray Copper is a proprietary finish with a special alloy. It is standard architectural copper produced in accordance with ASTM B370 that has been coated both sides with a proprietary tin/zinc alloy. Although the coating contributes to the product’s excellent corrosion resistance, it is applied for aesthetic purposes only. The finish provides a soft earth tone gray color that you will notice with Freedom Gray Copper. The tin/zinc-coated areas will prevent the substrate copper from oxidizing and producing green patina stains normally associated with uncoated copper. However, like other gray metals Freedom Gray Copper can produce a gray or black stain on light colored masonry and unpainted cedar shingles.