Ink

Keystone offers several product lines which can enhance ink formulations by adding layer of either overt or covert security.

Reversacol^™ UV Activated Photochromic dyes are solvent soluble dyes manufactured by James Robinson that change from colorless to colored when activated by UV light energy and then revert back to colorless. Keyfluor Optical Brighteners and Invisible Fluorescent dyes have no visible color but will fluoresce when exposed to UV light. Keystone has many solvent soluble dyes also, like our Keyfast Spirit dyes, that can be utilized in formulations where only by exposure to solvents can they be detected.