I Tested 3 Bread Knives on Crusty Sourdough: The Mercer Won

Some corners of the baking internet insist that once your crust develops properly, any sharp blade will slice it cleanly — others swear the blade type doesn’t matter at all as long as it has an edge. That second claim is the wrong one for crusty sourdough, and I found out why the hard way. Months spent refining my starter and dialing in fermentation still left me with mangled, squashed slices at the cutting board. That frustration is exactly what sent me hunting through every best bread knife sourdough review I could dig up, and it eventually led me to line up three knives and put them head-to-head on my own bakes.

By then my crust had turned properly tough — not a flaw, but a sign the bake had gone exactly right: blistered, deeply caramelized, and crackling when you tapped it. Trouble was, that same crust made my old serrated grocery-store knife look completely outmatched. Every pass dragged and flattened the crumb underneath it. The open, airy holes I’d worked hard to develop got pancaked before the slice even reached the plate.

Ten Inches of Blade: The Length That Quit Wrecking My Crumb

A wider blade gives you the reach and leverage to push through a stiff, just-baked crust without the knife rocking or getting stuck partway. Swap a narrow blade for the right width, and you’re looking at the difference between a clean, tidy cross-section and a loaf that looks like it lost a fight with a hacksaw.

Where this knife delivers

• That 10-inch reach lets a single confident downstroke handle the whole cut instead of sawing back and forth, which translates to less pressure on the crumb and crisper-looking score openings.
• The scalloped edge bites through the crust without hesitating, then moves through the soft interior without tearing it up — I saw the difference right away on my first tight-crumbed loaf.
• The grip stays comfortable through several loaves back-to-back without wearing out your hand, and the weight and balance never feel like something you’re fighting against.

Where it falls short

• At 10 inches, it’s simply a large knife — it won’t fit inside every knife block or drawer, so you’ll need to make deliberate room for it.
• Holding the edge means hand-washing and drying it carefully; run it through a dishwasher and it dulls fast, something I found out after one careless load.

I was skeptical that blade width alone could fix my slicing struggles—I thought it was just about technique—but the first time I used this knife on a loaf with an aggressive blister and an open crumb, I stopped making excuses. Get the Mercer Culinary M23210 Millennia Black Handle, 10-Inch Wide Wavy Edge, Bread Knife.

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