Clean MR, MZ, & TOM (Matte Brass, Matte White Bronze, and Tombac)
Bronze is an alloy, or a mixture of metals, comprised mainly of copper with typically tin and other metals. Bronze will oxidize when exposed to air, developing a patina coating: a brown, black, red or blue to green coating on bronze is a sign of normal, harmless corrosion. This outer layer protects the inner layers of the bronze object from deteriorating. This coating can be considered attractive or desirable. However, if you prefer to remove the patina, follow the instructions below.
- Distilled water (warmed)
- Old toothbrush
- Baking soda
- Lemon juice
- Rinse the bronze item in warm, distilled water and gently clean it with a toothbrush in order to remove dust.
- Pour 2 tablespoons (30 ml) of baking soda into a small bowl.
- Drip lemon juice—either fresh or concentrate—very slowly over the baking soda until the mixture is just wet enough to create a paste similar in consistency to toothpaste. You might see a little bubbling or some fizzing for a minute or two; this is normal.
- Gently rub the paste onto the bronze and leave it for about 20 minutes.
- Rinse with distilled water, rubbing with your fingers to remove all of the paste.