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Single origin Ethiopian medium roast from Coopers Coffee Company. Not bad -- pretty bright!
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What type of inconsistent are you talking about?
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I make cold brew using a paint strainer bag -- yes, you read that properly. I had a spare one and didn't feel like purchasing...
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Some quick reading on Quora (as crappy as that site is) indicates caffeine doesn't deteriorate for YEARS as it's a very stable compound...
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Could always try cold brew.