Add a security code to your documents, certificates, clearances with the COLOP ULTRAVIOLET (UV) Ink. Imprints are invisible in normal light but will glow under ultraviolet light. The UV ink is water-based and can also be used on customers’ hands at entrances to special events, dances, clubs, bazaars, etc. Each bottle is 25ml Bigger bottles of 250ml are also available. Please send us an inquiry.