Last reviewed: 2026-06-05
Starter smell rescue
Sourdough starter smells like acetone
A sharp nail-polish smell usually means the starter is hungry or stressed, not dead. Use the checklist to decide what to change.
A sourdough starter that smells like acetone, alcohol, or nail polish remover is usually hungry. Feed at a higher ratio, keep it warm but not hot, and repeat for 24 to 48 hours unless you see mold, pink/orange streaks, or rotten smells.
Acetone smell rescue checklist
What matches your starter?
Check what matches your jar. The result shows whether to feed normally, increase food, or discard for safety.
What the acetone smell means
The smell usually appears when the starter has consumed available food and fermentation byproducts become concentrated.
It is different from spoilage. Mold, pink/orange discoloration, and rotten smells are safety red flags.
A practical 48-hour reset
Keep a small amount of starter and feed 1:3:3 or 1:5:5 by weight for several cycles.
Use fresh flour, clean water, and a warm room. Track when the smell fades and when the starter peaks.
FAQ
Is acetone smell in sourdough starter bad?+
Usually no. It often means the starter is hungry. Discard only if you see mold, colored streaks, or smell rot.
Can I bake with starter that smells like acetone?+
It is better to refresh it until the aroma is clean and tangy, especially if the smell is strong or the rise is weak.
How do I stop my starter smelling like nail polish remover?+
Feed a higher ratio by weight, shorten the time between feeds, and keep the jar in a moderate warm spot.