I used the BrewTan B in the first experiment and most people couldn't tell a difference. I think there was a difference and probably more after some time in the bottle, however when I used it in my German Pilsner it gave the beer a weird grape flavor. I was planning on entering the beer in the NHC. The beer just tasted off, so I didn't enter it. I'm not sure why it was off, but the only change was the BrewTan B. This result leaves me on the fence, but I'd be willing to give it another shot.
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What was your dosage?
It was the recommended dosage for the experiment. I'm not sure off the top of my head, but it was added to the mash, sparge, and boil.
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