sourdough starter alcohol
I recently went on vacation for a month and left my sourdough starter in the fridge. When I came back, there was about 1/4 inch of alcohol on the top, which is normal after a long period without feeding. However, the alcohol had turned a dark color, almost grey. I smelled the alcohol and the starter, and everything seemed to be in order, so I just fed it again.
What does the darker alcohol mean? Is it anything to worry about?