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Both the aliquot method and the windowpane test involve pulling a small piece of dough and staring at it carefully. Both are used during bulk fermentation. But they measure completely different things — and using the wrong one at the wrong moment is one of the most consistent sources of confusion in sourdough baking.
This post ends the confusion permanently. By the end you will know exactly what each test measures, when in the bake to use it, and why combining both gives you more confidence than either one alone.
For a complete walkthrough of the aliquot method, see our step-by-step aliquot method guide for beginners. For the full aliquot jar setup with percentages, see our aliquot jar guide.
The One-Line Answer
The windowpane test measures gluten development. The aliquot method measures fermentation progress. They answer different questions at different stages of your bake.
- Windowpane test asks: “Has my gluten developed enough to hold structure through shaping and proofing?”
- Aliquot method asks: “Has my dough fermented enough to stop bulk fermentation and start shaping?”
What the Windowpane Test Actually Measures
The windowpane test is a gluten development check. It has nothing to do with fermentation progress.
To perform it: take a small piece of dough, wet your fingers, and stretch the dough slowly between your fingertips and thumbs into a thin sheet. If the dough stretches thin enough to be translucent — letting light pass through without tearing — it passes. This means the gluten network is sufficiently developed to trap the gas produced during fermentation and provide the structure needed for a good loaf.
If the dough tears immediately before becoming thin, the gluten needs more development — typically more time or another set of stretch and folds. If the dough is thin but tears easily and feels weak, the gluten has been degraded — usually a sign of over-fermentation, where acid has broken down the protein structure.
When to Use the Windowpane Test
The windowpane test is most useful at two specific moments: after your final set of stretch and folds to confirm gluten is strong enough before the long bulk fermentation rest, and when you suspect the dough may be approaching over-fermentation and want to check if gluten is still intact.
What the windowpane test cannot tell you: whether fermentation is complete. A dough can pass the windowpane test perfectly at 30% rise and still be severely under-fermented. Gluten strength and fermentation progress are independent variables.
What the Aliquot Method Actually Measures
The aliquot method measures fermentation progress — specifically, how much your dough has expanded as a percentage of its starting volume. It tells you nothing about gluten strength.
By placing a small sample of dough in a narrow clear jar at the start of bulk fermentation and watching it rise, you get an objective, measurable read on exactly how far fermentation has progressed. When the sample hits your target percentage, you stop bulk fermentation and shape.
When to Use the Aliquot Method
The aliquot method runs throughout the entire bulk fermentation — from the moment you finish mixing your dough to the moment you begin shaping. It is a passive, continuous monitoring tool that you check periodically rather than perform at a specific moment.
What the aliquot method cannot tell you: whether your gluten is strong enough to shape. Rise percentage and gluten strength are related but not identical.
Side-by-Side Comparison
| Factor | Windowpane Test | Aliquot Method |
|---|---|---|
| What it measures | Gluten development / strength | Fermentation progress / rise % |
| When to use it | After stretch and folds; end of bulk as a check | Throughout entire bulk fermentation |
| How to do it | Stretch a small piece of dough into a thin membrane | Watch a jar sample rise to target percentage |
| Pass = ready to shape? | Not necessarily — fermentation may still be incomplete | Yes, when target % is reached — if gluten is also developed |
| Requires setup? | No — done on demand | Yes — jar must be set up at start of bulk |
| Works for beginners? | Harder — requires feel and experience to interpret | Easier — objective visual measurement |
| Can be used alone? | No — only tells you about gluten, not fermentation | Mostly — but gluten check adds confidence |
Why Bakers Mix These Up
The windowpane test has historically been used as a proxy for “is bulk fermentation done?” — and this is where the confusion started. While a passing windowpane does correlate with a certain level of fermentation progress, it is not a reliable standalone indicator that fermentation is complete. A passing windowpane at 30% rise looks almost identical to one at 75% rise — but the fermentation state of those two doughs is entirely different.
The aliquot method emerged precisely because bakers needed something more objective. The windowpane tells you the dough is capable of holding structure. The aliquot tells you the dough has enough fermentation to produce the rise, flavor, and crumb you want. You need to know both.
The Best Approach: Use Both Together
- Set up your aliquot jar at the start of bulk fermentation and let it run throughout.
- Perform the windowpane test after your final fold set to confirm gluten development is solid before the long rest phase.
- When the aliquot jar hits your target percentage, check the main dough visually — look for a domed surface, bubbles on the sides, and a gentle jiggle.
- Optional: quick windowpane check at this point to confirm gluten is still intact and hasn’t degraded.
- Shape with confidence.
Which One Should Beginners Start With?
Start with the aliquot method as your primary guide. It is objective, doesn’t require experience to interpret, and tells you the thing that matters most for timing: how far fermentation has progressed. Add the windowpane test after your final fold set once you are comfortable with it. For most beginners, the aliquot method alone produces dramatically better results than any other single check.
Frequently Asked Questions
Can I skip the windowpane test if I’m using the aliquot method?
Yes — many bakers use the aliquot method alone and get excellent results. The windowpane test adds a useful gluten health check but is not required if your stretch and fold schedule is consistent. If the dough feels unusually slack at your target rise percentage, that is when a windowpane check is most valuable — it helps diagnose whether the issue is under-developed gluten or early over-fermentation.
What if I pass the windowpane but the aliquot hasn’t reached my target?
Keep waiting. Gluten development is sufficient but fermentation hasn’t progressed enough. Shaping at this point would give you a dense, under-flavored loaf despite having strong gluten. Continue bulk fermentation and monitor the jar.
What if the aliquot hits my target but the dough fails the windowpane?
Either gluten development was insufficient from the start (not enough folds, low protein flour) or the dough has gone slightly too far and acid has begun degrading the gluten. If the dough is slack and spreading, shape immediately into a loaf pan rather than a freestanding boule to compensate for reduced structure.
Does the windowpane test work with whole wheat or rye?
Less reliably. Bran particles in whole wheat and rye physically cut through gluten strands, making it very difficult to stretch a true windowpane. Most bakers of high whole grain doughs skip the windowpane test and rely on the aliquot method and visual cues instead.
Ready to put this into practice? See our complete aliquot method beginner guide and our bulk fermentation chart to match your target rise to your dough temperature.
Related reading: Aliquot jar setup and percentages · Bulk fermentation vs. proofing · What percentage rise to target