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Old 12-20-2012, 02:31 PM   #1
Caucasian
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Anyone ever put eggshells in a mash? Old timers would put a them in with coffee grinds.
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Old 12-20-2012, 02:39 PM   #2
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Any idea what they would add? The coffee I could see, but egg shells? Maybe a PH thing??
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Old 12-20-2012, 02:51 PM   #3
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From the little research I've done it seems that they lower bitterness and smooth out the coffee.
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Old 12-20-2012, 02:51 PM   #4
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Eggshells are used in wine making, i think, to help with clarity. I believe they just act as a fining agent. Not sure about the coffee grounds though.
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Old 12-20-2012, 02:54 PM   #5
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Calcium. The same reason you add egg shells to potting/gardening soil. But the ph is the target as mentioned. Check out Yoopers question on simple PH for brewers in the brewing science section. It'll blow your mind. Lol
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Old 12-20-2012, 03:30 PM   #6
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Calcium might be true. But I wonder how much you have to use for enough calcium to leach out. I know with gardening, the effects are more long-term. Eggshells take awhile to decompose and offer up that calcium.

Probably acts like rice hulls in a way too when it's time to sparge.
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Old 12-20-2012, 04:27 PM   #7
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guess we don't know if maybe the shells were dried and crushed before adding.......hmmmm, interesting
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Old 12-20-2012, 06:35 PM   #8
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+1 on the egg shells for wine as a clearing agent. I have done this, but they must be baked first. As for beer I never heard of that, unless it's to take the "sting" out of the coffee.
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