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Why does my green tea turn brown after a few hours?

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Rabrrrrrr Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:21 PM
Original message
Why does my green tea turn brown after a few hours?
Edited on Mon Jun-26-06 04:22 PM by Rabrrrrrr
I often make a pot of green tea and put it in a thermos that I use only for green teas.

I've noticed that after a few hours, the tea that went into the Thermos a nice green color turns brownish. The taste doesn't change, but the color does. Is this a normal function of green tea, that it will slowly turn brown? Or is it being stained somehow by the thermos? Or maybe being starved of oxygen? Or some other process?

Do you know the answer to this question?

And when I say green tea, I'm talking Japanese green tea, which is pretty fucking green, and some pretty high quality green tea at that.
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KitchenWitch Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:23 PM
Response to Original message
1. Only a guess here, but it might be oxidation
Kind of like why an apple turns brown after one cuts it. If you find the color unpleasant, you may want to add some citrus to it and see if that helps.
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Rabrrrrrr Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:24 PM
Response to Reply #1
3. Can I just yell it into submission? That would be funnier.
But I think you could be correct -
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KitchenWitch Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:39 PM
Response to Reply #3
6. It would be kind of like yelling at a wall
but Hey, I won't deny you that pleasure if that is what works for you!

:hi:
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Rabrrrrrr Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:49 PM
Response to Reply #6
8. I'll throw a pair of knickers at it, as well, and stomp my feet
in a petulant frenzy.
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KitchenWitch Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 09:08 PM
Response to Reply #8
16. Sounds good to me!
:hi:
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Spider Jerusalem Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:23 PM
Response to Original message
2. Not lack of oxygen, but oxidation
There's going to be a certain amount of air, and thus oxygen' inside the Thermos bottle when you seal it; the oxygen reacts with the tea and causes the colour change you notice.
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matcom Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:33 PM
Response to Original message
4. sorry. my fault.
:hurts:
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Placebo Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:38 PM
Response to Original message
5. I left a half-drank cup of green tea on a shelf in my bedroom...
for like 2 months.

And by the end of it's sad pathetic life it was a dark syrup-like substance that I'm pretty sure became an entity and life force.

Oh yeah, and it was also covered in black stuff. Don't really know what that was.

I guess this kind of takes your slight brownage to the extreme.

...

I'm just sayin'.
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Rabrrrrrr Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 04:47 PM
Response to Reply #5
7. Geez, always with the one-upmanship with you. I say brown,
Edited on Mon Jun-26-06 04:48 PM by Rabrrrrrr
you get black fuzz. If I'd said black fuzz, you'd talk about how you once had firebreating radioactive lizards coming out of it. I say I have pneumonia, you say you had double-pneumonia. I say I killed Wilford Brimley with the door of a smashed up '57 Chevy, you say you were anally probed with bottle rockets by the entire cast of CATS every night for 12 years.

:cry: :cry: :cry: :cry: :cry:
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Schema Thing Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 05:01 PM
Response to Reply #7
9. the latter
in my case.


Back on topic, isn't green tea supposed to be one of the best anti-oxidants? You'd think it would last longer before oxidizing. :think:
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Placebo Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 05:04 PM
Response to Reply #7
10. Your tea was personally brewed for you by the Emperor of Japan...
Edited on Mon Jun-26-06 05:07 PM by Placebo
I'm having tea and crumpets with Hugo Chvez, Hamid Karzai, Alan Greenspan, Michael Stipe, and Cindy Sheehan on their super secret island called "Isla Fubar".

Did I mention that Bono will be dropping in, literally, on a Hummer dropped via parachute from an American Cargo plane on its way to Iraq? And did I mention he will be delivering us some $500 per pair AIDS jeans? Yeah, I guess I forgot.

I'm just sayin', God.
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Rabrrrrrr Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 06:01 PM
Response to Reply #10
11. OMG! I actually win one! You get stuck Michael Stipe!
:P

YAY! Finally, i come off better than Placebo!

God, I'm sorry you have to spend the afternoon with such great people and have it ruined by him. How sad for you.
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GoddessOfGuinness Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 06:09 PM
Response to Original message
12. Maybe the anti-oxidants are oxidizing
? :shrug:?
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Callalily Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 07:53 PM
Response to Original message
13. According to this
it really shouldn't be turning brown. Maybe it's a (ahem) low grade tea.

http://www.taiyointernational.com/GTNC/GTNC_HealthBenef...
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Rabrrrrrr Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 07:57 PM
Response to Reply #13
15. The leaves aren't - it's the liquid after I brewed it.
And I think the others are right - it's the oxidization.
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Neoma Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Jun-26-06 07:57 PM
Response to Original message
14. I've noticed that also.
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