A new mixture and a previously reliable starter need different interpretation. Record its age, recent feed weights, flour, location and visible changes. A quiet jar does not by itself identify a dead culture, excess acidity or a temperature problem.
Rule out unsafe material first
Do not taste raw starter. If you see mold or pink/orange discoloration, discard the starter and clean the container; do not attempt to save an uncontaminated-looking portion. If its condition is uncertain, seek appropriate food-safety advice instead of relying on smell alone.
Look across a whole feeding cycle
Mark the level after a feed and look for a rise-and-fall line on the jar. An apparently flat starter may have risen before you checked it. Use measured quantities and repeat comparable conditions before changing several variables.
A larger feeding ratio supplies more new flour relative to the seed starter. It is not automatically a faster-strengthening treatment. Repeatedly diluting a young or inactive mixture is not the same as helping it establish.
Retest without a guaranteed deadline
Use a complete starter-maintenance method and record a series of feeds. There is no guaranteed three-to-five-day recovery protocol for every jar. A quick peak alone is not a health diagnosis or proof that all future loaves will rise.
Review starter fundamentals and maintenance. The earlier automated diagnosis has been replaced with this evidence checklist.
Sources & scope
- King Arthur Baking: maintaining a smaller starter
- King Arthur Baking: sourdough questions and starter spoilage
- FDA: flour is a raw food
Source-based explanation and editorial checklists by SourdoughStart, operated by Tag Ad Limited. AI-assisted article revised 2026-10-12. Source links are not endorsements.
Revision note: prepared for the new reference-led edition. Suggest a correction.