Lightly scratch the surface to see if it leaves a lighter colour scratch mark. If it does not scratch to a lighter colour (this means the colour remains the same) then this is a protected leather
Use soft cleaner and clean the leather. The cleaner should stay on top of the finish and should not darken the leather
The surface should have some sheen level to it. It is like looking at wood that has a lacquer finish compared to a wipe-on oil treatment.
