In the first ten minutes of the bake, the gas inside the dough expands hard and the loaf tries to grow by about a fifth. The crust is already setting. Something has to give.
An unscored loaf finds its own weakest point — usually a seam, usually somewhere ugly, sometimes blowing out sideways and dumping the oven spring out of the hole. A scored loaf has a weak point you chose, and it opens there.
So scoring isn't decoration that happens to be functional. It's function that happens to look good. Once you hold that, the rules below stop being arbitrary.
A double-edged razor blade, ideally on a handle — a lame. A very sharp paring knife works at a pinch; a serrated bread knife does not, and a butter knife will drag the skin off your loaf.
Blades are consumable. A blade that's done ten loaves drags instead of slicing, and dragging is what tears a score open into a ragged trench. Change it more often than feels reasonable.
Angle: 30–45° from the surface, not straight down. A shallow angled cut leaves a flap of dough — the skin above the cut is undercut, so as the loaf expands that flap peels up and back. That peeled flap, crisped by the oven, is the ear. A vertical cut can't make one; it just opens into a canyon.
Depth: about a centimetre, a bit under half an inch. Too shallow and it seals over in the first minute and the loaf bursts somewhere else anyway. Too deep and you cut through the tensioned skin you built during shaping, and the loaf deflates rather than springs.
Start with a single slash, slightly off-centre, running most of the length of the loaf. It's the most reliable score there is: one long weak point, all the expansion goes through it, maximum ear.
The wheat-stalk and leaf patterns you've seen are made of many shallow decorative cuts plus one deep structural one. The shallow cuts don't direct expansion — they just brown differently. If you make six cuts all at working depth, you've given the loaf six competing weak points, and it will open a little at each and spring dramatically at none.
Decoration is shallow. Structure is deep. Only ever have one deep cut, unless you're deliberately spreading expansion on a large flat loaf.
| Mistake | What happens | Fix |
|---|---|---|
| Hesitating mid-cut | Ragged, torn edge; skin drags | One continuous motion. Commit |
| Scoring at room temperature | Blade drags, dough deflates | Cut it cold, straight from the fridge |
| Blunt or reused blade | Tears instead of slicing | Fresh blade, wet it first |
| Six deep cuts | Expansion split six ways, no ear | One deep cut, the rest shallow |
| Perfect score, no spring | Not a scoring problem at all | No oven spring |
Notes from the counter
Scoring is where sourdough went most obviously aesthetic, and it's worth naming that the ear became a status symbol somewhere around 2020. There are people producing genuinely mediocre bread with spectacular ears, because the ear is mostly a function of blade angle and a cold dough and can be reverse-engineered without understanding anything else.
It's a nice thing to be able to do. It is not evidence of a good loaf. The cross-section is evidence of a good loaf.
That said — the reason scoring feels disproportionately frightening is real. It's the last irreversible act before the oven, after a day and a night of work, and you get one attempt. So the practical advice is: score it faster than feels comfortable. Every hesitant score is worse than a decisive one, and confidence here genuinely is technique rather than swagger.