Vintage Brass Findings are over 20 years old. Most were purchased from American companies that have made and produced these pieces from 100 year old stamping machines. Some are no longer being produced, some still are. I happen to have some of the old ones and they may have some patina on them from age. These are raw brass findings with no protective coatings. They can easily be cleaned with ammonia and water, vinegar and water or brass cleaner. Note, these cleaners will remove the natural patina or alter the color of the natural patina. Do not use these cleaners if you wish to maintain the natural patina.