Oxidation and corrosion tarnish pennies
oxygen
pennies don't rust, they're made of cooper, rust is iron-oxide (meaning it has iron and oxygen in it). But copper oxidises (tarnishes). so a liquid with a high oxygen content would work
Yes copper tarnishes !
Silver is commonly used to make jewelry and tarnishes over time due to exposure to air and humidity.
It tarnishes a ten yo boy
copper
Chemical change
Chemical change
Chemical change
the bank!
Oxygen
Pure tin is shiny but it quickly tarnishes and dulls.