UV Inks are invisible under normal light and are widely used but:
* Invisible UV Ink cannot dry without curing and is quite a challenge to clean, if spilled.
* Accidental ink exposure on the user will leave tracks wherever he/she goes to, till it is worn out.
* UV ink installation and startup costs are high due to requirement of the curing equipment.
* UV inks cause allergy and irritation in some people.