Leavening is the process by manual, organic or chemical means to add structure and form to your baked goods, making them lighter and more palatable.
Colonial Terms for Leavening Bread
Documenting manners of the 18th century

Instructions to make Levain

An Experiment in Leavening
18th century vs 19th century

Chemical Means of Leavening Baked Goods

Instructions to make Emptins

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