The Slightly Nerdier Sourdough Dictionary

Inoculation

The percentage of active starter or levain added to your dough, calculated relative to total flour.

More inoculation = faster fermentation.
Less inoculation = slower fermentation and often deeper flavor.

Think of it as your fermentation dial.
Cold kitchen? Increase it.
Hot summer day? Decrease it.

Inoculation controls timing more than the clock ever will.

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• 26–28 °C

Inoculation: 8–12%
Fermentation: Fast
Use less starter to prevent over-proofing.

• 24–26 °C

Inoculation: 10–15%
Fermentation: Moderately fast.

• 21–23 °C

Inoculation: 15–20%
Fermentation: Medium (standard range).

• 18–20 °C

Inoculation: 20–25%
Fermentation: Slower. Increase starter slightly.

• 16–18 °C

Inoculation: 25–30%
Fermentation: Slow. Consider warming the dough.

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Practical Example (500 g Flour Dough):

If your kitchen is 18 °C, aim for about 20–25% inoculation.

That means roughly 100–125 g prefermented flour in your dough.

If your kitchen is 25 °C, you might reduce that to 50–75 g prefermented flour to avoid over-fermentation.

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Prefermented Flour

The portion of flour that has already fermented inside your starter or levain before mixing the final dough.

This is what actually determines inoculation — not just the weight of starter.
Two starters at different hydrations can change this number significantly.

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Hydration

The percentage of water relative to flour in your dough.

Higher hydration = more open crumb potential, more extensibility, stickier handling.
Lower hydration = tighter crumb, easier shaping, more control.

Hydration isn’t about showing off. It’s about matching flour strength and your skill level.

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Dough Temperature (DDT – Desired Dough Temperature)

The temperature your dough should be after mixing to ferment predictably.

Fermentation speed is driven more by dough temperature than room temperature.
Professional bakers calculate this. Home bakers learn to feel it.

If your dough is cold, everything slows.
If it’s warm, everything accelerates.

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Over-Fermentation

When bulk fermentation goes too far.

The dough becomes overly slack, sticky, fragile, and hard to shape.
Gas escapes easily. Structure weakens.

It’s not about rise percentage alone — it’s about gluten strength relative to gas production.

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Under-Fermentation

When bulk is cut short.

The dough feels tight, dense, and lacks aeration.
Oven spring may be dramatic — but crumb can be tight or uneven.

Under-fermented dough hasn’t built enough internal structure or flavor.

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Enzymatic Activity

Flour contains enzymes that break starch into sugars.
These sugars feed yeast and bacteria during fermentation.

Longer fermentation = more enzymatic breakdown = more flavor and browning.

Too much? The dough weakens.

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Acidity Balance

Sourdough fermentation produces both lactic and acetic acids.

Warmer, wetter fermentation → more lactic (milder, yogurt-like).
Cooler, stiffer fermentation → more acetic (sharper, vinegary).

Flavor is not random. It’s environmental.

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Cold Retard

Refrigerating shaped dough to slow fermentation.

This improves flavor, scoring control, and crust development.
The fridge isn’t just storage — it’s a timing tool.

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Fermentation Window

The optimal period where dough strength and gas production are in balance.

Bake too early → under-developed.
Bake too late → collapse.

Your job isn’t to follow the clock.
Your job is to learn where the window is.

If you’d like, I can also help you write a short transition paragraph between your beginner and advanced dictionary — something like:

"Once you stop asking ‘Why didn’t it rise?’ and start asking ‘What was my dough temperature?’ — you’ve crossed over."