To persons interested in solvent soluble 'black light' visible dyes- try  the 
Uvitex OB (optical brightener) type materials. The water soluble  versions 
are the ones that 'make white shirts whiter than white' - especially in  the 
black lights of discos, etc. 
We used a solvent soluble version in certain soldering aids (e.g. temporary  
solder masks) which were dissolved in the CFC-113 based cleaning agents at the 
 same time as the flux residues in one easy step. 
Variants of that version may well work in the VPS fluids you wish to track.   

Bill  Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO  80526
Tel: 970.207.9586   Cell:  970.980.6373




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