Are These Quarters Errors?

If you are asking about all four quarters colouring, these all look to be environmentally tarnished/stained/dirty. How did they get this way? Who knows. Damage can happen in a million different ways. Some of these could have spent time buried in soil, or in the bottom of a coffee cup holder, the bottom line is the one thing for certain, they did not leave the mint looking like this, therefore they are not "errors'. These all are considered post mint damage ( PMD).

The majority of the time, please, we need just one coin per thread. Replying to different problems in one thread is very problematic. If you were asking something other than your coins colouration, please post your coins/questions in a separate posting. Thank you.

Yes @merc nailed it--chemcial/environmental toning on these (probably from being buried).