My other hobby is learning to make a good espresso. A coffee guy is recommending I mix 2 grams citric acid in 150ml of water. This is done to learn and distinguish sour vs bitter. When looking at the citric acid I have it says aquarium use only but it’s pure citric acid. The FDA says citric acid is generally safe. I’m confused and I know this is a weird question lol. Is all citric acid not the same ?
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