What's the Difference Between Bleached and Unbleached Flour? (2024)

Kelli Foster

Kelli FosterSenior Contributing Food Editor

Kelli is a Senior Contributing Food Editor for Kitchn. She's a graduate of the French Culinary Institute and author of the cookbooks, Plant-Based Buddha Bowls, The Probiotic Kitchen, Buddha Bowls, and Everyday Freekeh Meals. She lives in New Jersey.

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updated Dec 7, 2022

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What's the Difference Between Bleached and Unbleached Flour? (1)

Flour is an important pantry staple. It plays a crucial role in so many baking projects from cookies and cakes, to quick breads and pies. When shopping for a sack of all-purpose flour, you’re faced with a choice: bleached or unbleached flour?

Which one do you reach for? And do you know what sets them apart?

The Difference Bleached and Unbleached Flour

Technically, all flours are bleached, but it’s the process by which it happens that sets these two types of flour apart. Bleached flour is treated with chemical agents to speed up aging, while unbleached flour is bleached naturally as it ages. This affects not only the color and grain of each type of flour but the end result of baked goods.

Bleached flour is whiter and has a softer texture. It produces fluffy baked goods, making it a good match for cookies, pie crusts, and pancakes. Unbleached flour is less white and has a denser consistency. It tends to be best for baked goods that require structure, like yeast breads, eclairs, and pastries.

What Is Bleached Flour?

Bleached flour uses bleaching agents (commonly benzoyl peroxide and chlorine gas, among others) to speed up the flour’s aging process. This results in a whiter, finer-grain flour with a softer texture. Some people with sensitive palate can notice a difference in taste with bleached flour.

The bleaching process softens the flour, the effects of which are reflected in finished baked goods. Foods made with bleached flour tend to have a softer texture, more volume, and a brighter color than those made with unbleached flour.

Bleached flour is best for making cookies, pie crusts, quick breads, muffins, and pancakes.

What Is Unbleached Flour?

Unbleached flour is flour that has aged naturally after being milled. It has an off-white color, which continues to dull as it ages, and a more dense grain than bleached flour. Just because this type of flour hasn’t been bleached doesn’t necessarily mean it hasn’t been treated with other chemicals. All brands are different, so it’s important to read the label to know what you’re buying.

Unbleached flour also takes longer than bleached flour to produce, and because of this, it’s usually more expensive.

Having a denser texture, unbleached flour provides more structure in baked goods, which makes it an ideal base for things like yeast breads, cream puffs, eclairs, and pastries.

Can You Substitute Bleached for Unbleached—And Vice Versa?

As it ages, flour is naturally bleached from exposure to oxygen. Unbleached flour, which takes longer to produce, ages naturally, while bleached flour uses chemical agents to speed up the process. The end result is two types of flour: one with a bright white hue and fine grain (bleached flour) and one that’s pale and off-white with a denser grain (unbleached flour). Because of their different textures, each flour produces slight variations in baked goods.

So, what does that mean for your baking? While there may be differences in color, volume, and even smell of your baked goods from using one flour over the other, they will be slight.

For baked goods, the overall basic outcome is the same with either flour. Your muffins will still rise, your cookies will still be delicious, and that layer cake will turn out just fine.

What's the Difference Between Bleached and Unbleached Flour? (2024)

FAQs

What's the Difference Between Bleached and Unbleached Flour? ›

In brief: Unbleached flour is naturally aged after milling, during which time it slowly oxidizes and whitens. Bleached flour, on the other hand, uses chemical treatments to manually speed up this process. Both can be used interchangeably in baking; so why should you choose one over the other?

What is the difference between bleached flour and unbleached flour? ›

In brief: Unbleached flour is naturally aged after milling, during which time it slowly oxidizes and whitens. Bleached flour, on the other hand, uses chemical treatments to manually speed up this process. Both can be used interchangeably in baking; so why should you choose one over the other?

Why is unbleached flour more expensive? ›

Because it hasn't been put through the same chemical treatments, unbleached flour can have a more dense grain. Since it also takes longer for unbleached flour to be produced (the waiting time and storage add costs for the manufacturer), it often is more expensive than its bleached counterpart.

Which flour is best for baking? ›

All-purpose flour is best used for: cookies, muffins, bread, pie crusts, pancakes, biscuits, pizza dough, and pasta.

Is it better to use bleached or unbleached flour for pasta? ›

Note: Don't use bleached all-purpose flour in our pasta dough recipes, as the bleach will weaken the proteins in the dough and will make the starches prone to bursting when they are boiled, resulting in pasta with pitted, pebbly surfaces.

Why can't you use bleached flour for a sourdough starter? ›

All purpose flour is fine, but I realized that when flour is bleached…it kills off the naturally occurring yeast. Aside from bleached flour, you can use pretty much any type of flour or combination of them. I kept with all-purpose because it's readily available. Take two: I got some Unbleached All Purpose Flour.

Is it better to use bleached or unbleached flour for banana bread? ›

Yes: some with a very sensitive palate might be able to taste a difference, but in general we find there is no discernible difference in the volume, texture etc. of baked goods made with bleached versus unbleached flour.

Which flour is best for frying? ›

Rice flour and cornstarch work particularly well because they fry up crispier than wheat flour. They also absorb less moisture and fat during the frying process, making the products less greasy. This is why rice flour is often used when making tempura because it produces a very thin and crispy, dry crust.

What is the healthiest flour to bake with? ›

Thus, whole wheat flour is widely considered healthier. It's a good source of protein, fiber, and a variety of vitamins and minerals. As it contains gluten, it isn't appropriate for people with celiac disease or non-celiac gluten sensitivity.

What is the best flour to replace all-purpose flour with? ›

Either cake flour or pastry flour can be used as a 1:1 substitute for all-purpose flour in most baking recipes. Steer away from cake flour for chewy bread baking, though, and opt instead for bread or whole-wheat flour for your no-knead and sourdough loaves.

Which flour makes bread rise the most? ›

Wheat flours are usually the first choice of most bakers. This is due to the lightness and high rise created by higher levels of gluten content. However, if you're intolerant of wheat or looking for gluten-free bread options, there are a wide range of low gluten and gluten-free flour options available.

When not to use unbleached flour? ›

Cakes: For light, delicate cakes like yellow cake, angel food cake, and chiffon cake, use bleached flour, especially when the recipe calls for cake flour. For sturdier cakes like carrot cake, pumpkin loaves, quick breads, and muffins that can tolerate a denser texture, use either bleached or unbleached.

Does flour go bad? ›

The rule of thumb here is the more protein, the lower the shelf life. For low-protein types of flour, like all-purpose or cake flour, you have about a year from the date of purchase to use it. For higher protein varieties, like bread flour, the clock runs out quicker; you'll get about nine months.

Is bleached or unbleached flour better for pizza? ›

If you're planning on cooking pizza at home, the most important tip is to choose unbleached flour. However, here are some more tips below on using unbleached flour: While it's true that bread flour has a higher rise and crispier crust, unbleached flour retains a more subtle flavor. Besides, it's healthier for you.

Is unbleached flour healthy? ›

Opting for unbleached, whole-wheat flour may increase your intake of several nutrients and minimize your exposure to potentially harmful chemicals. Still, both varieties can be used interchangeably in most recipes without significantly altering the final product.

Is all-purpose flour bleached or unbleached? ›

Technically, all flours are bleached, but it's the process by which it happens that sets these two types of flour apart. Bleached flour is treated with chemical agents to speed up aging, while unbleached flour is bleached naturally as it ages.

How to tell if flour is bleached? ›

There are a few ways to determine if a flour is bleached:
  1. Check the packaging: Look for keywords such as "bleached" or "unbleached" on the front or back of the flour package. ...
  2. Color: Bleached flour is usually whiter in color compared to unbleached flour, which tends to have a slightly off-white or creamy color.
Sep 17, 2023

Is bleached flour banned in Europe? ›

2. Azodicarbonamide. In the US, flour can be treated with a compound called azodicarbonamide, serving as both a bleaching and dough-fortifying agent. This compound, however, is prohibited in Europe as well as Australia due to its potential to degrade into a carcinogenic component.

Is bleached or unbleached flour better for pizza dough? ›

If you're planning on cooking pizza at home, the most important tip is to choose unbleached flour. However, here are some more tips below on using unbleached flour: While it's true that bread flour has a higher rise and crispier crust, unbleached flour retains a more subtle flavor.

Is white bread bleached? ›

The flour used in white breads is often bleached further—by the use of flour bleaching agents such as potassium bromate, azodicarbonamide, or chlorine dioxide gas to remove any slight natural yellow shade and make its baking properties more predictable.

What is the difference between King Arthur flour and regular flour? ›

Some flour brands allow wide fluctuations in their protein content, so every time you use it, you'll get slightly different results. King Arthur Flour is milled with the strictest specifications in the industry. Baking with flour that's consistent in protein will give you the best, most consistent results at home.

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