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34
votes
20answers
90k views

Caffeine content of cold-brewed coffee: higher or lower than hot-brewed?

I recently rediscovered the joys of cold-brewing coffee. (One level cup of rough-ground beans, 4-1/2 cups of cold water, steeped overnight and strained, produces a rich coffee concentrate. A shot or ...
12
votes
2answers
14k views

How can you measure the caffeine content of a liquid at home?

I saw a question on here about cold brew vs hot brew caffeine content and was wondering what is the easiest (or best) way to measure this at home (if possible)
12
votes
8answers
15k views

How can I maximize the caffeine content of my coffee?

Like many people, I rely on coffee in the morning to really get me going for the day. I always use more than the directions require to get more caffeine for that extra morning jolt. How much ground ...
6
votes
9answers
35k views

Does brewing tea for longer result in higher caffeine content?

The ISO standard for brewing tea says "6 minutes". Of course different teas have vastly different properties, but... For "average commodity black tea" and "average commodity green tea", will leaving ...
15
votes
3answers
19k views

Does black tea have the the highest level of caffeine? If so, why?

So it's usually said that tea in general has lower levels of caffeine than coffee and that black tea has more caffeine than green tea (which has more caffeine than white tea). This suggests that the ...
3
votes
3answers
432 views

Similar flavors to caffeine?

My wife and I enjoy drip coffee, french pressed coffee, espresso, black tea, green tea, and just about anything caffeinated. However, my wife wants to avoid caffeine due to its physiological effects. ...
1
vote
3answers
766 views

Why does caffeine taste bitter when added to tea?

Black tea contains about 40 mg of caffeine. When adding 80 mg of caffeine powder, the tea tastes bitter. Why doesn't caffeine that is already in the tea or in an energy drink taste bitter and how ...