So I take extremely good care of all my razors. I hand dry them after use and then let them air dry for about an hour thereafter followed by a quick stropping before storage.

About two weeks ago I shaved with my vintage French razor, went through my proper cleaning/drying ritual after and then placed it in it's cardboard container for storage. Fast forward to today and I pull it out and the whole front side of the blade has dark patina stains all over it. The horror!!! Just so happens to be the side with the etching on it

On the plus side, the razor still shaves great and the staining mysteriously stops right where the blade's edge begins. Anybody know what happened? Has anyone faced something like this and will the staining come off?

Thanks!