When it goes wrong · Proof
The dough barely moved after hours.
Can you save it?
Reviewed for this symptom
Test the yeast: a pinch in warm sugared water should foam in ten minutes. If it foams, move the dough somewhere warmer and wait; if it does not, the yeast is dead and the dough will not rise — bake it flat or start again.
How to confirm the diagnosis
Observable cues, not inferred user state
- No change in volume after two hours
- The liquid was hot when the yeast went in
- The room is cold
Not this?
- It rose beautifully, then collapsed in the oven into a dense slab.
- Huge irregular holes and a pale, tight crumb underneath.
- A dry skin formed on top and it baked with a crust through the middle.
What actually happened
Only this symptom
Dead yeast, a cold room, or salt added directly onto the yeast before mixing. Yeast that has been killed by hot liquid — above about 50°C — never recovers.
The full mechanism
Shared by every proof failure
Yeast consumes sugars and produces carbon dioxide and ethanol. The gas cannot escape a properly kneaded dough because the gluten network is elastic and gas-tight, so it inflates thousands of tiny pockets and the dough expands. Two things govern the rate: temperature and food. Yeast works fastest around 25-30°C and slows sharply when cold, which is what a refrigerated overnight rise exploits — the slow fermentation produces more flavour compounds relative to gas. Enriched doughs, with sugar, butter and egg, rise more slowly rather than faster: sugar competes with the yeast for water and fat coats the gluten, so expect close to double the time a lean dough takes. Over-proofing is a real failure and not just excess: the gluten stretches past what it can hold, and the structure collapses in the oven.
The full Proof lesson — how to tell, where to practise it, what it carries to.
Next time
Prevent this specific failure
Proof the yeast first, keep liquids under 40°C, and keep salt from touching the yeast directly.
What right looks like
Shared by every proof failure
- The finger dent test is the reliable one. Press a floured finger about a centimetre in — if it springs back fully it needs longer, if it fills in slowly and leaves a soft mark it is ready, if it stays fully dented and sighs it has gone too far.
- Roughly doubled in volume, judged by eye against the container rather than by the clock.
- The surface goes from matte and slack to domed and slightly taut.
- It smells faintly of beer and bread rather than of raw flour.