Scoring the top of a bread loaf before baking controls the direction of expansion during baking, preventing unwanted cracks and creating an attractive appearance.
When bread dough is placed in a hot oven, the yeast rapidly produces carbon dioxide, causing the loaf to expand. Without scoring, this expansion will occur randomly, often resulting in unsightly and unpredictable cracks in the crust. Scoring, also known as slashing, creates a weakened area on the surface of the dough. This allows the expanding gases to escape in a controlled manner through the cuts, directing the loaf's expansion upwards and outwards. The depth and angle of the score influence the final shape and appearance of the baked bread. Different scoring patterns can create various decorative effects, adding to the visual appeal of the loaf. Furthermore, scoring helps to ensure even baking by allowing heat to penetrate the interior of the loaf more efficiently.
Use a lame (a special bread scoring tool with a razor blade) or a very sharp knife for clean, precise cuts. A dull blade will drag on the dough, resulting in uneven scores and a less attractive final product.