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Questions tagged [caffeine]

32 questions
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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 one type, the bubbles linger, whereas in the other…
daGUY
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Why do industrial drinks mark caffeine as a flavoring?

The ingredients list is sometimes written "Flavors: ... Caffeine" (Arômes: ... Caféine) on official Coca-Cola cans and home-brand cola bottles here in France. Why is caffeine marked as an aroma rather than an ingredient? It makes it sound like…
bandybabboon
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What is a reliable source for the caffeine content in tea?

If you do a quick google search for "Tea caffeine content" you may get varied results anywhere from 20mg up to 45 for black tea. I wonder: Where do all these numbers come from? Are they estimations? Has anyone actually measured caffeine in all tea…
Bar Akiva
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English Breakfast vs Ceylon tea

Which tea is stronger, i.e. gives a better puch for a wake up? I know that English Breakfast is a mix which among others includes Ceylon, and I read that Ceylon is a very strong black tea (the strongest apart from Chinese uberteas?). So, does it…
noncom
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What's a microscoop?

I've bought pure caffeine powder and its serving size is said to be a microscoop, but no measure of weight is given. So what's/what size is a microscoop? "Microscoops" can be found from the internet, but their size is 7-12mg. Is this reasonable for…
mavavilj
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Is Pickwick green tea deceffeinated?

I am referring to this brand: http://www.amazon.com/Pickwick-Green-Tea-Original-Packages/dp/B003YBNJH8 The box doesn't say anything. I drank several and while I felt weird, my pulse was normal. I can't find any info on this tea and their website is…
ulak blade
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Caffeine pills don't dissolve in hot tea

I'm drinking Rooibos Vanilla Tea and I like to dissolve an 80 mg caffeine pill in it. I hand press the pills myself from pure caffeine powder. However, the pill doesn't dissolve very well in the tea. Instead, it either breaks into smaller pieces…
bytecode77
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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 should caffeine be added to drinkable fluids so it…
bytecode77
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Is there any caffeine in kuding tea?

Does anyone know if the bitter kuding tea (苦丁茶) contain caffeine?
MikeW
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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.
Omer van Kloeten
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How much EGCG and caffeine can specific amount of water absorb from tea leaves?

For example; 1) 100mL water + 4 tablespoons of green tea leaves 2) 100mL water + 12 tablespoons of green tea leaves Will the second one result with higher EGCG and caffeine content? Or is there a upper limit for the absorbable amount? If not, how…
Leloux
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How much caffeine is in matcha powder?

I would like to know how many milligrams of caffeine are there in a gram of dried matcha powder.
Martin Drozdik
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Tea that lingers is more bitter, does it also contain more caffeine?

For convenience, I tend to brew tea in a French press. Just drop a bunch of tea leaves, add hot water, let the leaves dance in the water for a little while, and then push the press down and serve (I know there are probably a million better ways to…
FZS
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How do I prepare (any) coffee with desired caffeine concentration?

I’m an student from Tampere, Finland, and I’m doing an essay on the effects of coffee (caffeine). However, how to determine the caffeine content in each serving of coffee is unclear. How do I prepare ~5 servings of each: Coffee with ~0mg of…
Francisco V.
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Why would coffee cause stomach cramps? Are there alternatives to Caffeine?

As a student, I am (I was) caffeine-dependant. But whenever I drink coffee I get stomach cramps. Is there a biological/biochemical explanation for this? Why would caffeinated coffee have this effect for some, like me, but not others? Is there a safe…
Tofuw
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