Envelopes and fluorescence

[db]

Specifically white envelopes. Has anyone ever seen a blue fluorescence when opening the glued flap?
What causes this and why only on white envelopes (but not all white envelopes)
Best viewed in a darker room for those about to try it

[Eggman]

It's called triboluminescence. According to that article sugar does it too, which I didn't know.

[db]

thank you

[Simpo Two]

Now you need to ask yourself why you're opening envelopes in a darkened room...


Gottit. You need to keep opening envelopes to create light so you can read the contetns of the first one!

[db]

Simpo Two said:

Now you need to ask yourself why you're opening envelopes in a darkened room...


Gottit. You need to keep opening envelopes to create light so you can read the contetns of the first one!

aye, that's it.
or i'm a tight Scot who uses street lights when possible. purely to save the planet though

[SlipStream77]

You might find this interesting.

http://www.nytimes.com/2008/10/28/science/28xray.h...

[db]

an X-ray from sellotape! that's impressive