Silver is rust free. It will not and cannot rust in the true sense of the word. The reason being is because silver doesn’t react with water or pure air to form reddish brown rust. Silver tarnishes. It forms a black deposit when exposed to water or air containing hydrogen sulfide and ozone. Good news is that this black deposit can easily be cleaned off with diluted hydrochloric acid. It’s however not that easy to clean off rust. This tips the scale in the favour of silver, especially when compared to other metals that do rust.