Is this mold on my bread dough?

[LauraLoo]

I wish I could attach a picture, but don't have the time.
I've been making bread using the "Artisian Bread in 5 Minutes" and I went to pull out my container today, and the top of the bread dough was darker (like a gray color) than the dough underneath. The dough smells normal. I made the dough about 4 days ago. Does this happen over time, or is my dough bad?

[425lisamarie]

If you let really wet dough sit the top gets like that. Same as if you soak grains in buttermilk and get a thick batter, the next day the top is duller color. It's fine

[LauraLoo]

Thanks! I was hoping that I wouldn't have to ditch it, but would have.