Scoring Sourdough: Patterns And Blade Angles

You have spent two days on this loaf. The starter was active, the bulk went well, the shaping left a taut dome in the banneton. Then it comes out of the oven with a lumpy, blown-out side where the crust cracked on its own terms instead of yours. The problem almost certainly happened in the ten seconds before you closed the oven door.

Scoring is the cut you make in the surface of the dough just before baking. It is not cosmetic. The cut creates a controlled weak point in the crust so that when the dough expands rapidly in the heat of the oven, the expansion is directed through that opening rather than through a random spot where the crust happens to give way first. Done correctly, scoring gives you an ear, a bloom, and a loaf that looks like you made the decisions. Done incorrectly, or skipped entirely, the oven makes those decisions for you.

Tools And What They Do

The standard tool is a lame, which is a curved razor blade mounted on a stick. The curve matters. It lets you pull the blade through the dough at a shallow, almost horizontal angle without dragging the handle into the dough surface. A straight razor blade held between fingers works the same way and is cheaper, though it requires more care with your fingers and wrist angle.

A very sharp kitchen knife can score a loaf in a pinch. Use a thin blade, move quickly, and accept that the result will be less precise than a razor. A serrated knife almost always catches and drags, tearing the dough surface rather than cutting it. Reserve the serrated knife for slicing the finished loaf.

A single-edge razor blade mounted straight on the stick produces a different cut geometry than a curved lame. The straight mount holds the blade perpendicular to the stick, which is better for decorative patterns that need precision. The curved mount holds the blade at an angle, which is better for the angled cuts that produce an ear.

Keep your blade sharp. A dull lame drags and compresses the dough surface instead of slicing through it. If the blade is pulling rather than cutting, replace it. Most bakers replace their blades after two to four loaves.

Blade Angle And What It Changes

The angle of the blade against the dough surface determines whether you get an ear or an opening. This is the single most important variable to understand.

Hold the blade at 30 to 45 degrees from horizontal, almost parallel to the surface of the loaf, and cut at that angle. This produces an ear: a raised lip of crust that peels back as the loaf expands. The angled cut separates a flap of dough from the surface below it. When the loaf expands in the oven, that flap opens outward and backward, creating the distinctive raised edge you see on a well-baked sourdough.

Hold the blade at 60 to 90 degrees, nearly vertical against the dough surface, and you get an open bloom without a distinct ear. The cut spreads symmetrically rather than peeling back. This angle is better suited to cross patterns, wheat stalk designs, and other decorative work where symmetry matters more than an ear.

Depth is the other variable. A quarter inch is a reliable default for most loaves. Too shallow and the cut seals during baking as the moist surface skin closes before the crust sets. Too deep and you cut through the tension you built during shaping, and the loaf deflates rather than rising. In practice, a swift decisive cut at the right depth feels lighter than you expect. If you are pressing firmly, you are likely going too deep.

Patterns That Work

The single slash is the place to start. Draw the blade from the top of the loaf to the bottom in one smooth motion, at the 30 to 45 degree angle described above. The blade should travel from the 12 o’clock position to the 6 o’clock position, offset slightly to one side of center. This one-cut approach produces a reliable ear and a loaf that opens symmetrically in one direction.

The cross or hash pattern uses two cuts perpendicular to each other. Score from 12 to 6, then from 9 to 3, keeping both cuts at a steep angle. The result is an X-shaped opening that blooms from the center. This works well for loaves that will be torn and shared at the table, since the four quadrants open like petals.

The wheat stalk pattern requires five to seven diagonal cuts arranged in an offset herringbone. Make the cuts at a steep angle, which keeps them decorative rather than structural. Start from the top of the loaf and work down, alternating left and right of the center line. This pattern is primarily visual, and the loaf will expand more from the central area than from the individual cut lines.

Simple geometric patterns, concentric arcs, parallel lines, diamonds, look best on loaves that are very well proofed and have a smooth surface. Underproofed loaves blow out through the weakest point regardless of how carefully you scored, and an irregular surface from a rough shaping job makes clean cuts harder to place consistently.

Cold Dough Versus Room Temperature

Scoring is easier on cold dough. After an overnight retard in the refrigerator at 38°F/3°C, the dough is firm and holds its shape when you apply the blade. The score line stays open rather than sealing immediately, and the sharp edges of the cut are visible and distinct.

Scoring a dough at room temperature, especially after a warm final proof, is possible but requires a faster, lighter hand. The dough surface is softer and more likely to drag. Use a colder blade (store your lame in the freezer for ten minutes before scoring) and work more quickly.

If your loaf spent 12 to 18 hours in the refrigerator, score it directly from the fridge and load it into a preheated Dutch oven without delay. The contrast between the cold interior and the 500°F/260°C oven creates a more dramatic oven spring than baking a room-temperature loaf.

Common Mistakes

Scoring too shallow is the most common cause of a loaf that bursts on the side rather than blooming through the cuts. If you are uncertain about depth, err slightly deeper. A slightly over-cut loaf may open more dramatically than intended but will still taste good. A too-shallow cut often produces no bloom at all.

Scoring a dough that has already torn from rough handling or over-proofing will not rescue the loaf. If the surface of the proofed dough shows cracks or ruptures before you cut, those are signs the dough has exhausted its structure. Scoring will not create an ear where the dough has no tension left to peel back.

Scoring through a heavy layer of rice flour creates resistance that can prevent the cut from opening. Rice flour is invaluable for keeping the dough from sticking in the banneton, but before scoring, invert the loaf and brush away any thick clumps from the surface. A thin even dusting is fine. A crust of flour over the entire surface defeats the cut.

Finally, hesitating mid-cut drags the blade and tears the surface. Commit to the motion before the blade touches the dough. One smooth pull is better than two cautious partial cuts. If you are nervous, practice the motion in the air before making contact.

Next Steps

The score is the last decision you make before heat takes over. Once the loaf goes into the oven, your work shifts to timing: covered for the first 20 minutes to trap steam, then uncovered to brown and crisp. The ear you built with the blade will be visible within the first 15 minutes, rising and peeling back as the crust sets.

If you are building your first sourdough loaves from scratch, the shaping guide covers the step that happens just before scoring, and getting that step right makes scoring significantly easier. A well-shaped, well-tensioned loaf gives you a surface that responds to the blade the way you want it to.