Why 80% hydration changes everything

Hydration is just the ratio of water to flour by weight. A 100g flour, 80g water dough is 80% hydration. That number gets thrown around in baking forums like a status symbol — "I baked at 92% this weekend" — but the actual reason to push hydration up isn't the number. It's what wetter dough does to the bread.

What changes between 70% and 80%

• Crumb opens up. More water means more steam during the bake, which inflates the alveoli (the holes). At 80%+ you start getting the "open" crumb people post on Instagram — large, glossy, irregular holes.
• Crust gets thinner and crispier. More steam, more surface gelatinization, more crackle.
• Flavor deepens. Wetter dough ferments differently — the lactic and acetic acid bacteria have more water to work in, and you get more pronounced sourdough flavor without longer fermentation.
• Slicing changes. An 80% loaf has a more tender, almost custardy interior. It tears differently. It absorbs olive oil like a sponge.

What you give up

Wetter dough is harder to handle. It's stickier, harder to shape, more prone to spreading on the bench and pancaking in the oven if you don't have the gluten development right. The window for under-proofing is narrower. The shaping is unforgiving.

If you're not getting consistent results at 75%, going to 80% will mostly produce frustrating results. The recipe doesn't get better — your skills do.

How to actually get there

1. Start at 75%. Bake it three times in a row with consistent results — even crumb, decent oven spring, no pancaking.
2. Move to 78%. Add the 30g of water during the autolyse, not after. Same recipe, same timeline.
3. Pay attention to the dough's behavior. At 78% it should still pass the windowpane test by the third stretch-and-fold. If it's still tacky and weak, the gluten isn't there yet.
4. Once 78% is reliable, try 80%. Same flour, same starter, same technique. The dough will feel notably looser. That's normal.
5. Above 82% requires high-protein flour (~13%+ protein) and very developed gluten. Don't try this with all-purpose.

The flour question

King Arthur Bread Flour is 12.7% protein and works for up to ~80%. For 82-90%, you want something like Central Milling Artisan Bakers Craft Plus (13.7%) or a high-extraction freshly milled bread flour. White whole wheat absorbs more water, which lets you push hydration higher without losing structure.

Some bakers credit specific brands for their open crumb. Most of the time it's just consistency — they're using the same flour every bake and they've tuned their technique to it. Pick a flour, learn its behavior, and don't switch mid-improvement.

Open crumb is the byproduct of a well-fermented, well-shaped, well-baked dough. It's not the goal — it's the receipt.