What causes bubbles on bread

Looked at closely:
The bun error "bubbles on the crust"

Tips and Tricks

What causes vesicles to appear on the crust?

These blisters can have a number of causes. The most common cause is a dough surface that is too moist due to excessive moisture in the proofing room.

Most of the time, however, the error occurs when guiding via the fermentation time control. There are three main causes in total:

  • Too long storage time at too high storage temperature
    The dough pieces are exposed to excessive enzymatic degradation due to the long storage time. Too high a storage temperature also accelerates the activity of the enzymes. If the storage time is shortened or the storage temperature is reduced, these degradation processes are reduced and the risk of blistering decreases. Practical tip: Even if the freezing times in the freezer or the time it takes to reach storage temperature is too long, the enzymes can have too strong an effect.

  • Formation of condensation on the dough
    If a dough piece is heated or acclimatized too quickly from cool storage temperatures or from freezing, a lot of condensation forms on the surface of the dough piece. This moist surface encourages the formation of bubbles on the crust. Slow heating or acclimatization of the dough prevents the formation of condensation and thus prevents the formation of bubbles.

  • Too much steam at too high a baking temperature
    A large amount of steam at a high baking temperature promotes the formation of bubbles on the crust. This can be remedied by reducing the steam while simultaneously lowering the caking temperature. When setting the baking program, however, subsequent errors such as a blunt surface or narrow bulges should be avoided.


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