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2. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   Metal roof. A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope. The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.

3. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   24-karat gold is pure (while 100% purity is very difficult to attain, 24-karat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-karat gold is 12 parts gold (12 parts another metal), and so forth. [20]

4. Stone-coated metal roofing - Wikipedia

   en.wikipedia.org/wiki/Stone-coated_metal_roofing

   Stone-coated metal roofing. A stone coated metal roof is a roof made from steel or some other metal; the metal is then coated with stone chips and attached to the steel with an acrylic film. The goal is a more durable roof that still retains the aesthetic advantages of a more traditional roofing material [1]

5. Gold - Wikipedia

   en.wikipedia.org/wiki/Gold

   In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals. It is one of the least reactive chemical elements, being the second-lowest in the reactivity series. It is solid under standard conditions.

6. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [4] Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [3]

7. Ductility - Wikipedia

   en.wikipedia.org/wiki/Ductility

   Ductility refers to the ability of a material to sustain significant plastic deformation before fracture. Plastic deformation is the permanent distortion of a material under applied stress, as opposed to elastic deformation, which is reversible upon removing the stress. Ductility is a critical mechanical performance indicator, particularly in ...