plant that glows orange when cut

my wife pulled up some plant today and noticed that at night the sap type stuff glows orange i am try to figure out what this is and is it safe

 

Interesting! Can you put some picture of this plant or at least describe how does it look?

 

Chelidonium majus maybe?

This has orange sap.

https://www.google.co.uk/search?ix=...g&biw=1280&bih=647&sei=gmutT_v0CZKv8QPPl8jjCg

http://en.wikipedia.org/wiki/Chelidonium

More here about the hazards!

http://www.pfaf.org/user/Plant.aspx?LatinName=Chelidonium+majus

 

Perfect!
http://www.itp.uni-hannover.de/~zawischa/ITP/luminescence.html

 

Thanks Andrey for your link.
I thought that was really interesting that
quote..."A drop of swallowwort's sap on the skin can be detected under UV, even if after washing several times nothing is seen any more under daylight "