a strong, UV-activated tracer needed!

[Maged Hussein]

is there anybody over there who knows a tracer it is strongly fluorescent 
under a normal UV light source. i am running a macro-scale test upto 5 feet. a 
good tracer under microscopic scale usually does't work well in this 
situation. any info or recommendation is welcome and preciated. i don't mind 
it is toxic or not, as well as price and emission color.
p.s.: a normal UV light source should be 2-4 bulbes and be put 3-5 ft away 
from object interests.

jianyou (jerry)