The crystal is 13% of your total weight of grains. It depends on what you like, but I think it's a little much. I made a beer once where I went overboard on the crystal. It was still drinkable, but it was just a little to heavy and sweet. I'd shoot for something closer to 5% imho.
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Not all chemicals are bad. Without chemicals such as hydrogen and oxygen, for example, there would be no way to make water, a vital ingredient in beer.
-Dave Barry-
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