Marisa Mason pieces are cast in San Fransisco and the castings are cleaned up in their studio in Oakland with rotary tumblers and careful hand polishing.
Brass is an alloy made up of mostly copper and zinc. Brass will naturally oxidize over time with exposure to air and water. This darkening of the metal can be easily removed with a metal polish. To keep from constant polishing, we advise keeping your brass pieces in a dry air tight space when not wearing.