2002 D Tennessee State Quarter With Mint Error On Reverse?

Google images of the coin and do a comparison with yours.

Looks normal to me.

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Well I am no expert on the minting process. Read up on it some so I guess my question would be is there any possibility that one side of the coin is not washed properly at the mint therefore it doesn't get the shiny appearance? This coin the obverse looks normal with the shiny appearance, but the reverse is consistently very dull looking a faint gray color. As Dearborn mentioned grease, how is grease involved in the process? Sorry if you think it is a dumb question, but as I have read on this site often there are no dumb questions. We are all here to learn. Thanks.

The coins are not washed individually at the mint after each strike. The planchet is rinsed before going thru the minting process.

At a mint, blank planchets are typically rinsed with water after the annealing process, which softens the metal, to remove any residue left from the heating process and ensure a clean surface before being struck into a coin; this rinsing often happens in a washing machine with specialized cleaning agents depending on the type of coin being produced.

Just remember : there will never be a dumb question for learning this hobby, you'll never learn if you don't ask a question or research.

Read the following:

https://www.usmint.gov/learn/produc...:%20Striking