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Questions tagged [caffeine]

32 questions
43
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20 answers

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 three of concentrate in a mug topped with hot…
goblinbox
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2 answers

How much caffeine would there be if I reuse tea leaves in a second brewing?

If you look for information about the amount of caffeine present in a cup of tea, the amounts vary depending on the kind of tea, if the tea is bagged or loose leaves, the brand, and other factors. Nonetheless, the values estimated range from the 25…
Charlie
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21
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2 answers

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)
bound008
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3 answers

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

It's 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 higher degree of fermentation of the tea, the higher the…
citizen
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9 answers

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 coffee should I use to reach caffeine critical mass…
Frank Pierce
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12
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4 answers

Difference in caffeine levels between light and bold coffee?

Over the last few years I had come to believe that the roasting process for bold coffees removed caffeine from the beans resulting in a lower caffeine content than compared to a light roasted coffee. I got this idea from Good Eats with Alton brown.…
JSuar
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12
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12 answers

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 the tea bag in longer (say 1 hour or 1 day)…
themirror
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11
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1 answer

How do they get caffeine out in decaffeinated coffee?

Coffee beans naturally contain caffeine. At the store or in a restaurant, you can choose "decaffeinated coffee". Is really all the caffeine gone or is there just a smaller amount? How do they remove the caffeine from the beans?
Mien
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8 answers

Bagged or Loose Leaf Tea

What are the practical differences between using bagged vs. loose leaf tea? Are there differences in quality, caffeine content, etc.? Why?
ClaudeShannon
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3 answers

Multiple tea infusions and caffeine concentration

I have read conflicting things about the volatility and solubility of caffeine, and at what point during the tea brewing process caffeine is released. When tea is used for multiple infusions, such as in Gongfu style brewing, do the different…
Anthm
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7
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1 answer

What method of coffee preparation gives the most caffeine in the finished cup?

As the question asks, which method from the list below will give the most caffeine in the final product (ie. a cup of coffee). Assume the same beans with the same grind (while the different techniques should use different grinds, lets try and keep…
NBenatar
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7
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2 answers

All else held equal, does a pot of tea have more total caffeine than a mug?

Let's say you have one tea bag and can either brew it in a mug of boiling water, or a larger tea kettle of boiling water. The temperature, steeping time, type of tea bag, etc. are held constant. Assuming you drink all the tea that gets made, would…
Milo P
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5 answers

Why does instant coffee have less caffeine?

I had gone completely cold-turkey on caffeine for a while due to anxiety issues, and I'm slowly reintroducing caffeine to my diet. I have read in many places that freeze-dried instant coffee has less caffeine than the equivalent amount of…
fluffy
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Does steeping the same amount of tea in different volumes of water lead to the same or more caffeine?

If I were to steep the same amount of tea in two vessels of hot water: one 12oz cup and one 24oz carafe, would the 24oz carafe have more caffeine or the same amount? Assume steeping is the same amount of time.
Chris Matta
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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. Unfortunately, in her words, decaf espresso…
mskfisher
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