Dark brown sugar

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Dark brown sugar nutrition and vitamin info per 100g

Samsung Food
Dark and light brown sugars are not exact substitutes. Using dark brown sugar when a recipe calls for light, it will give the final product a more robust taste and a darker color, and it might slightly affect the texture.
Samsung Food
If you ask a difference between dark and light brown sugar, dark brown sugar actually contains nearly twice as much molasses as light (6.5% as compared to 3.5%), which gives it a richer caramel flavor.