The Key Differences In Rye Flours That Every Bread Baker Should Know - Tasting Table
Briefly

The classification of rye flours ranges from light to coarse, based primarily on the amount of bran and germ left after milling, affecting flavor and texture.
Rye flour's color can be misleading; its type is determined more by bran and germ content rather than appearance, necessitating precision in recipe selection.
Read at Tasting Table
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