Red 620 is an invisible UV‑A fluorescent pigment supplied as a beige powder that becomes vividly red under 365 nm UV excitation, with an emission peak around 618 nm. It offers low water solubility and fine particle size, making it suitable for gravure, flexo, offset, and screen inks while maintaining strong fluorescent intensity and stable color performance. This pigment is designed for applications that need reliable UV‑responsive marking or security features.