Before:No...No it doesntReal and correct answer: yes because of the acid in the coke/pepsi they eat away at the dirt.(coke/pepsi does the same thing 2 ur stomach-DONT DRINK IT!)
When a penny is new, it's bright and shiny, but like most other metals, after oxidization (exposure to oxygen) or in the presence of moisture or salts, it can be covered by a dull oxide coat....