* Silver: The most well-known example. Silver tarnishes due to a reaction with sulfur compounds in the air, forming a black silver sulfide layer.

* Copper: Forms a greenish-blue patina (copper oxide and copper carbonate) when exposed to air and moisture. While it protects the underlying copper, it's considered tarnishing.

* Brass: This alloy of copper and zinc also tarnishes, forming a similar patina to copper.

* Gold: While highly resistant to tarnishing, it can still form a dull layer when exposed to air containing sulfur compounds. This is usually less noticeable than silver's tarnishing.

* Iron: Forms rust (iron oxide) when exposed to oxygen and water. While rust is technically corrosion, it's often considered a form of tarnishing.

* Lead: Forms a white layer of lead oxide when exposed to air.

* Magnesium: Reacts quickly with air, forming a white magnesium oxide layer.

Factors that affect tarnishing:

* Humidity: Moisture in the air accelerates tarnishing reactions.

* Air pollutants: Sulfur compounds, ozone, and other pollutants can contribute to tarnishing.

* Temperature: Higher temperatures generally increase the rate of tarnishing.

* Exposure to food: Foods containing sulfur can cause silver to tarnish quickly.

* Contact with other metals: Metals can react with each other, leading to tarnishing.

Note: Tarnishing doesn't necessarily mean the metal is damaged or unusable. In some cases, like the patina on copper, it can even be aesthetically desirable.