Thread: Lather stains

I have got 2 razors that both have what I call lather stains. Both on the side of the blade with the etching. I wonder whether that is mere coincidence or does etching makes a blade more prone to corrosion and staining on the side of the etching. I like to think I always dry my blades meticulously.
Pics aren't great but you can see a wave-like pattern on both blades. Pattern looks very much like the way lather sticks to a blade after one or a few strokes.

Any thoughts?