What happens to Brass in Citric acid?

Answer 1

It will dissolve brass slowly. It can be used as cleaner, but it results in a reddish color. Rinse the brass parts with H2O2 may get back the original color, too much and it will turn greenish.

Answer 2

When brass is exposed to citric acid, a chemical reaction called corrosion occurs. Citric acid reacts with the copper in brass, forming copper citrate and releasing hydrogen gas. This process leads to the degradation of the brass surface, resulting in a loss of shine and the formation of a dull appearance.