This ultraviolet formula marks with invisible ink and cannot be seen until placed directly under a black light.
Marks on plastic, glass, metal and other non-porous surfaces
Water-based formula
Durable fiber tip with Pump Action Technology
Ergonomic, non-slip, rubber Pro Grip
Handy pocket clip-on cap
Multi-lingual packaging
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This is the best way to mark high touch areas in a hospital to see if areas are being cleaned properly. It is water based and very easy to clean off of surfaces.
I would definitely recommend this product