Goodish tint on newer Washington Quarters

I have found several quarters from 2000 on that have a slight goodish tint. I don't think they are plated, as you can see the copper layer from the side. What would cause this and would this be from the mint? I couldn't find any information on them. Thanks!

 

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They're both plated. Here's an old Coin Talk thread with photos of coins with missing clad layers: https://www.cointalk.com/threads/coins-missing-clad-layer-s.254745/
Or, you can ask @paddyman98 to show you some of his.

 

Normal and it's toning.

 

Not plated, they are clad as you can see from the edge. Toning can take many routes.

 

I wondered about toning, as some are only tinted around the edges fading as it needs the center.

 

Just depends on the environment they are stored in. Take a nice new one and put it in the bottom of the oven the next time you use it.