Copper and Brass wire both tarnish. To slow the process its best to store the pendants in a recloseable plastic bag or jewelry case with anti-tarnish paper. You may clean the copper or brass with a cleaner specifically made for copper/brass jewelry or try a solution that you can make from basic household ingredients. You will need the following ingredients to make your solution:
1/2 c powdered detergent 1/2 c flour 1/2 c salt 3/4 c white vinegar 1/4 c lemon juice 1/2 c very warm water jar with lid (quart size)
Mix the dry ingredients together in a bowl. Then stir in the liquid ingredients. Mix this solution together well and then transfer the mixture to a glass jar with a lid that you can close tightly. When ready to use the cleaning solution simply shake a small amount onto a cloth and proceed to rub it into the surface of the copper and brass pendant. If having trouble getting to the tight spaces try using an old toothbrush to help. When done, rinse the pendant thoroughly with water and carefully rub dry with a clean cloth. Remember while cleaning to make sure to carefully handle the pendant so you do not accidentally bend any of its parts. Please note that brass can turn black when cleaning due to over-use and misuse of polish. So, always be careful when cleaning your pendant.