Baking

Bread (Loaf)

A loaf of bread is sold and measured by the piece or slice rather than volume, and the specific milling and fermentation process behind a given loaf — white, whole wheat, sourdough — determines far more about its texture and keeping quality than any single conversion figure could.

Sourdough's longer, wild-yeast fermentation process gives it a naturally longer shelf life and more complex flavor than a commercial yeast-leavened loaf, since the acidity that fermentation produces has some inherent preservative effect.

Bread staling is a distinct physical process from mold growth — starch molecules recrystallizing over time, which is why a stale loaf can often be revived somewhat by brief reheating, while a moldy loaf cannot be salvaged the same way.

The Pullman loaf pan, a lidded rectangular pan that forces dough to bake into a perfectly square-sided sandwich loaf, takes its name from the Pullman Company's railway dining cars, where the space-efficient square shape made for more uniform, easily stored slices in a cramped kitchen.

Pre-sliced bread wasn't sold commercially until 1928, when Otto Rohwedder's automatic bread-slicing machine debuted in Chillicothe, Missouri — an innovation popular enough, and novel enough at the time, that it gave English speakers the enduring phrase "the greatest thing since sliced bread."

US federal fortification standards required enriched bread to include added iron and B vitamins starting in the 1940s, and folic acid fortification was added to that requirement in 1998 specifically to help reduce the rate of neural tube birth defects nationally, a genuine public-health measure rather than a marketing addition.

An artisan loaf's large, irregular crumb holes and a standard sandwich loaf's tight, even crumb reflect two genuinely different doughs and goals — a wetter, longer-fermented artisan dough traps larger gas pockets as it bakes, while a sandwich loaf is deliberately built with a tighter structure so it holds sliced fillings without falling apart.

Medieval England regulated the price and weight of a standard loaf directly through the Assize of Bread and Ale, a law dating back to the 13th century that set legal standards for bakers well before any modern food-labeling regulation existed, reflecting just how central bread was to the medieval diet and economy.

A loaf's crust develops its deep brown color and complex flavor through the Maillard reaction, the same browning chemistry responsible for a seared steak's crust, triggered by the high, dry heat of an oven rather than the moister environment inside the loaf itself.

Steam introduced into the oven during the first few minutes of baking, a technique home bakers sometimes replicate with a pan of hot water or ice cubes, helps a crusty artisan loaf develop a shinier, more shatteringly crisp crust than a standard home oven produces without it.

Store-bought sandwich bread and a home-baked or bakery loaf differ in more than just flavor — commercial sliced bread typically includes added preservatives and dough conditioners specifically to extend its shelf life and keep its texture consistent, additives a simple flour-water-yeast-salt bakery loaf generally does without.