Starter & measurements
pH needs context
My starter has a low pH: is it ready to bake with?
An acidity reading is useful only with the product, sampling time and measurement method.
Understand the process
pH measures hydrogen ion activity on a logarithmic scale: a change of one unit is not a small linear difference. In a starter it describes the medium, not the yeast count or its ability to raise the next dough.
Titratable acidity and pH answer different questions. Flour buffering changes their relationship: starters made with different flours can have the same pH but different acid contents. pH alone does not reveal the ratio of lactic to acetic acid.
Step by step
- Identify flour, hydration and the last starter:flour:water feeding ratio.
- Record time, temperature and rise stage with every reading.
- Use the same method and wait for the display to stabilise.
- Observe surface, consistency, smell and volume alongside the reading.
- Compare these observations with dough fermentation time and the cooled loaf.
What to record
- pH, time and sample temperature
- Volume and appearance at sampling
- Bread made with that starter
PROPOSED EXERCISE · VALIDATE IN YOUR CONDITIONS
One trial, one variable
Record your usual indicators over comparable bakes without changing the process.
Add pH tracking during subsequent comparable bakes.
Keep comparable
Same starter, flour, formula and measurement method.
What to look for
Look for a repeatable pattern associated with good results, rather than a target number.
Record unexpected differences, then repeat before adopting a change.
Mistakes to avoid
- Judging starter vitality from one reading.
- Applying a stiff pasta madre threshold to liquid rye starter.
- Inferring an acetic flavour from pH alone.
Conditions of use
There is no universal maturity threshold. A single pH reading is not a food-safety check.