Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: neilep on 07/02/2009 19:51:08

Title: Why My Tea Go Cloudy, And Was It safe To Drink ?
Post by: neilep on 07/02/2009 19:51:08

Dearest Vacuum Flaskologists,

See This vaccum flask !(from a swedish outlet near ewe !)


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Yesterday evening (about 6pm)  I made some green tea and poured it in there. It was very nice. Oh yes indeed !


Well, today at 2pm I remembered my flask of tea and guess what..it was still hot !

So, I imbibed a couple of small cups and then chucked it (poured it through my neighbours letterbox of course)

I did notice that it was somewhat cloudy ?..Why was it cloudy and was it actually safe to drink ?

Ewe often hear of cofee turning carcinogenic when it's been left in a hot cofee thingy for hours...would the same have happend to green tea in a (swedish outlet) vacuum flask ?...and why was it cloudy too  ? !!


Thank ewe for you tea orientated answers.I have no milk nor sugar in mine !....which is nice !



Hugs and shmishes





mwah mwah mwah !!



neil
I wonder About The Nature Of Tea Left In A Flask Overnight
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Title: Why My Tea Go Cloudy, And Was It safe To Drink ?
Post by: DrN on 14/02/2009 22:26:42

I think this has nothing to do with the flask - so don't worry about it eroding the silver lining and being poisoned.

if you let tea cool slowly without icing it first (by pouring it over lots of ice to chill it quickly) then it will go cloudy. I'm guessing this is due to some component of the tea being soluble in hot water, but not in cold, and therefore precipitating out upon slow cooling.

Green tea is alkaline, so maybe a slice of lemon would neutralise the pH and prevent the precipitation? I feel an experiment coming on ...