Why You Should Always Score Bread Dough, And What Happens When You Don't - Tasting Table
Briefly

"Scoring allows you to determine the path for steam to escape by creating intentional weak spots... If you don't score your bread, the steam will likely escape from the seams... This can make for unsightly rips called blowouts."
"Ideally, a scoring tool just needs to be razor-sharp... Thin blades produce cleaner cuts than thick ones. Blades that can be curved will be more versatile than inflexible ones..."
Read at Tasting Table
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