The Keychain consolidates various passwords and passphrases in one place and makes them accessible through a master password or passphrase. When an application (including the Finder) needs to access a password stored in the Keychain, the application asks you to unlock the Keychain if it's not already open.
Nutritional Summary: There are 345 calories in a 100g serving of Tesco Plain Flour. Calorie Breakdown: 3% fat, 84% carbs, 12% prot.
However, bleached flour is even worse. At some point in history, milled flour was always unbleached. This old school flour comes out in a pale yellow color and it is aged for about 12 weeks. This aging process allows for the proteins and gluten develop, which makes it better for baking. Also, during this process, the flour bleaches and becomes whiter.