Brand New 2022 D Dime Shiny On One Side .

I would concur with JBuck that the Denver facility has consistently struck better quality business coinage since the middle 2000's. I'd also agree with Earle42, the center console of a vehicle has a way of dulling copper/nickel quite rapidly. Just a thought. Thanks for sharing!

The alloy used for nickels and the outer clad layers on dimes, quarters, and halves are susceptible to environmental damage also resulting in a darker appearance. Unless you are getting them from mint bags or rolls it would be hard to know exactly what its been exposed to during its circulation. They can also develop toning. Here are some of the things I've read that can cause a coin to tone dark or can cause a coin to turn a variety of colors, from deep grey or black to mottled or speckled.

Experimentation with acid, or just normal corrosion
Burial in the ground
Being tossed in a water fountain
Exposure to intense heat, or very cold temperatures
Storage in a paper envelope, PVC plastic, or open-air case
Contact with caustic chemicals or fumes, such as sulfur or gas
Sitting in a warm and humid environment for long periods of time
Placed in old fashioned coin folders or albums can also cause toning, potentially attractive, with colors ranging from light blues and pinks even to rainbow colors.

to the CCF!