Prefermented flour

Prefermented flour is not a separate ingredient. It is a way of reading a formula: how much of the total Wheat flour already went through Fermentation in a Preferment before the dough was mixed. Calvel treats that share as a control in technical breadmaking — flavor, acid, and gas in the sponge versus the final dough ¹.

King Arthur Baking's overall baker's percent is the arithmetic. Their French bread with Poolish looks like 40.12 lb dough flour plus 38.66 lb poolish. Split the poolish and the flour total is 59.44 lb; about a third of that flour lived in the sponge ². Until you recast, you cannot see the share, and salt and water look absurd.

The same move applies to Levain, Biga, or Pâte fermentée: add preferment flour to dough flour, then divide. That number is not Inoculation. Inoculation is how much leaven you put in; prefermented flour is how much of the bread's flour already fermented. A tiny yeast poolish can still preferment a large fraction of the flour.

What to notice #

High prefermented flour: more preferment aroma and a dough that can mature faster, or over-acidify if the sponge was already spent. Low: closer to a straight dough. The failure is judging the dough from the un-recast formula — "48% water" — and then "correcting" a bread that was already 65% ².