Copper is ductile, malleable and has high thermal and electrical conductivity. Copper is resistant to atmospheric corrosion but attacked by oxidizing agents such as nitric acid, ferric chloride, cyanides, and ammonia acid compounds. Copper when exposed to the atmosphere it will naturally develop a thin green layer, known as patina. Copperïs unique colour makes it a very popular option for many different types of users, including designers, artists, architects and homeowners.Copper Expanded Wire mesh specification the most versatile mesh uniformly slit and stretched, forming a diamond pattern of openings in the finished sheet and has numerous patterns by using the different molds.