Spray with clear acrylic lacquer one day after the copper has been cleaned and dried. If the copper tarnishes, redo the process. Keep running water close by to dilute and rinse spills. Cover well when not in use. All acid work must be done outdoors away from children, animals, plants, cars, houses, etc.
Clean water is the best rinse.
We do not recommend ammonia, caustic soda, or any other neutralizer. If you have questions, see our Comment Page .