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CRUMB
A term used by bakers to define the inside of a bread or pastry - its
internal cell structure. Many factors can influence the cell structure
of the crumb. For example, a high hydration dough that has not been
over kneaded, has been properly shaped, and has sufficient yeast
available at the time of baking to produce a good, final oven spring
will generally result in a crumb that is open and airy with a lot of
large, irregularly-sized and shaped holes (called alveoles).
Conversely, a dough with low hydration, rolled rather than hand shaped, and with low yeast levels at the time of baking (resulting in a poorer oven spring) will generally result in a crumb that is more bread like, with small, even-sized and tightly formed cells.