Hi Christine, great questions! Dark rye flour is often a whole grain rye that contains all of the germ, bran, and endosperm of the rye berry, just like pumpernickel. But dark rye is a confusing label that can sometimes be used for flours that don't contain the whole grain, so it's best to stick with pumpernickel flour to guarantee you get the whole rye grain. That said, pumpernickel can often be a coarser grind than whole grain dark rye flours.

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