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Thermos flask question

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Chickadee | 13:24 Tue 11th Jan 2011 | Food & Drink
4 Answers
Hi All

When I heat up the thermos prior to putting soup in it, how long should I leave the boiling water in?

Its been so long since I used the flask that I have forgotten!!

Thanks
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Question Author
Thank you redhelen.
I wouldn't even say that long is needed, it only to take the chill off the inner surface so a few seconds should be fine.
1 min 33 seconds exactly or it will implode :-)

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