Natural Copper: The most common appearance is a shiny, reddish-brown metallic finish when new. Over time, pure, uncoated copper naturally undergoes oxidation when exposed to air and water, which causes it to develop a darker, brown patina or even black, green, or turquoise spots.
Hammered: Many sets feature a "hammered" texture, which adds a decorative, multi-tonal, and reflective quality to the natural copper color.
Lacquered/Silk-Finish: To maintain the original shine and prevent natural tarnishing, some bottles are coated with a protective lacquer. These are available in various finishes like polished, matte, or silk-finish.
Brown: Many product descriptions use the term "brown" to describe the standard oxidized or natural look of the copper.