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Float Test Fails

Mixing

The float test (dropping a spoonful of starter in water to see if it floats) indicates gas production. If it sinks, the starter may not be active enough for baking.

Try This Right Now

  • 1Wait longer—starter may not be at peak yet
  • 2Feed starter and check again in 4-6 hours
  • 3Look for other signs: bubbles, volume increase, domed top

Detailed Solutions

Wait for Peak

Easy

Starter floats best at peak activity.

  1. Note when you last fed starter
  2. Peak is usually 4-8 hours after feeding
  3. Look for doubled volume and domed top
  4. Test again when these signs appear

Trust Other Signs

Easy

Float test is not always reliable.

  1. Check if starter has doubled
  2. Look for active bubbles throughout
  3. Smell should be pleasantly tangy
  4. These signs can be more reliable than float test

Why This Happens

Starter fails float test when it lacks sufficient gas bubbles to float, either from being past peak or not active enough. Contributing factors include: Starter not at peak activity, Tested too soon after feeding, Tested after starter collapsed, Starter genuinely inactive, Dense starter formula.

Prevention for Next Time

  • Test at peak—when starter has doubled and is still domed
  • Note timing from feed to peak for your starter
  • Use multiple indicators, not just float test
  • Keep starter at consistent temperature for predictable timing

Related Issues

Having other problems? Check out these related troubleshooting guides.