What others have said:
"Rheinzink is the world’s leading brand of architectural-zinc for building applications. Generically known as “titanium-zinc”, Rheinzink is a natural-weathering metal that forms a blue gray patina after repeated exposure to moisture and air. Combining 99% super high-grade zinc with approximately 1% titanium and copper, the Rheinzink alloy can provide long-term solutions for roofs." www.morincorp.com
The applications for Rheinzink's titanium zinc include roofing, roof dormers, facade cladding and roof drainage systems. Titanium zinc from Rheinzink is very popular as a modern material and offers a wide scope for design which has been widely appreciated by modern architects. Its durability and high recycling rate make it the preferred choice of material for classical roof drainage systems using gutters and pipes.