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32
votes
18answers
52k 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 ...
14
votes
3answers
11k 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 ...
12
votes
8answers
11k 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 ...
11
votes
4answers
16k views

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. ...
10
votes
8answers
1k views

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?
10
votes
1answer
5k views

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 ...
7
votes
2answers
10k 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)
6
votes
8answers
21k 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 ...
5
votes
3answers
8k views

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 ...
4
votes
1answer
388 views

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 ...
4
votes
2answers
110 views

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 ...
3
votes
2answers
187 views

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. ...
3
votes
3answers
372 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. ...
3
votes
2answers
1k views

Are there visual differences between regular and decaf coffee?

I once asked a waiter at a restaurant how he managed not to mix up cups of regular and decaf coffee when bringing them to various tables. He replied that he could tell by looking at the bubbles – in ...
2
votes
2answers
242 views

Which Type of Japanese Green Tea Has the Highest Amount of Caffeine?

I am trying to find the best pick-me-up Japanese green tea and was wondering which type was the best to get from the assortment of Sencha, Gyokuro, Kabusecha, Bancha, etc.
1
vote
1answer
245 views

Is there any caffeine in kuding tea?

Does anyone know if the bitter kuding tea (苦丁茶) contain caffeine?