> There is a clear watery ink used (absorbent pad and rubber stamp) to make
> a mark on the back of someone's hand to indicate "paid" admission at the
> swimming pool.
> It's quite waterproof and hopefully non-toxic. It has no visible colour under
> daylight or normal light, but shows up brilliantly under near UV. Perhaps it
> could be added to a compatible solvent paint of any colour, to add UV
> reflectance.
 
You are confusing fluorescence with UV reflectance.  What is wanted is
paint that will reflect UV, rather than emit visible light when
illuminated with UV.
 
--
Malcolm Roe                            Phone  :  +44 442 230000 ext 4104
Crosfield Electronics Ltd              Fax    :  +44 442 232301
Hemel Hempstead, Herts. HP2 7RH, UK    E-mail :  [log in to unmask]
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