Dewar Flask: Clinging Noise Inside?

[+energy]

I have an old dewar flask i found on clean up day, i was wondering, when i shake it, i hear a strange clinging noise inside, what could it be? (its the type used for bio samples)

 

[Danger]

Have you tried looking inside? My first thought is that it's broken, and a piece of glass is rattling around between the walls.
Also, I assume that you mean a clanging noise. Clinging is usually silent, with perhaps a moan or two.

 

[+energy]

I can just see the bottom, where the sample holders go, there are no signs of break, but there could be a crack at the top somewhere. only way i can check it still has vacuum, is to fill it with n2 or ice and see how long it lasts?

Sorry about my onomatopoeia

 

[Danger]

Sorry about my onomatopoeia

Don't be; I can't make jokes without ammunition.

edit: Come to think of it, can you use an inspection mirror? That's a small mirror on the end of a telescoping handle similar to a an old portable radio antenna. You can get one for a couple of bucks at any auto parts supplier and most hardware stores. (They're used by mechanics to check in tight spaces and under things.)

 

[FlexGunship]

I believe this happens when the scotch hardens into candy.

 

[Danger]

Jeez, Flex! Long time, no giggles. From wherever you've been hiding, welcome back.