Just dodged a huge mistake with my sourdough starter after a tip from a baker in Boise.
I was about to toss my starter because it had a layer of dark liquid on top after I neglected it for a week. Thought it was a sure sign of mold or death. But I remembered a baker I met at a market in Boise last fall who told me, 'That's just hooch, you idiot. Pour it off, feed it, and it'll come back.' I was skeptical, but I did exactly that. Fed it equal parts flour and water (50 grams each) twice over 48 hours, and it's bubbling like crazy now. Has anyone else revived a starter that looked completely gone? What's your 'last resort' feeding ratio?
That's not exactly what a dead starter means though. A starter that's just gone quiet or looks inactive can often be revived with regular feedings, but a truly dead starter has mold or a bad smell like rot or alcohol. People mix up "dormant" with "dead" all the time in these discussions. A dormant starter just needs a few days of consistent flour and water to come back strong. A dead one has gone bad and can make you sick if you use it. So the real risk is knowing the difference, not just tossing everything that slows down.
Is it really that big of a risk? A lot of starters can be brought back with a simple feeding. I've done it myself more than once. It just takes a little patience and some flour. Seems like throwing it out is giving up too fast.