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How do I make my bread really dark?
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It might be that the bakers of the really dark stuff are using a caramel colouring, I have seen a couple of recipes that use it: https://artisanbreadinfive.com/2008/10/26/pumpernickel-bread-how-to-make-your-own-caramel-coloring/
I could imagine it might be popular with commercial/artisnal breadmakers as people think darker breads are healthier breads.