[s-cars] Coolant Leak

[JR]

Is there a black light visible dye that is safe to put in the cooling 
system of these cars?  I have a very slow leak somewhere in the cooling 
system.  It takes a few thousand miles for the level in the reservoir to 
drop to the point that the dash alarm starts beeping when I go around 
corners.  I can see a drip here and there when I am driving the car 
daily.  If I leave the car parked for weeks I can see a spot of wet 
pavement under it where it is collecting, but I cannot for the life of 
me locate the source of the drip under the hood.

JR