Invisible pH Inks
pH Inks are formulated specifically for Security printing and
authenticity of Secure documents where a permanent, but invisible
reaction is required. The
invisible portion of the ink will fluoresce under long wavelength UV
light at a specific color, once an alkali or an acid is applied.
These inks will change the fluorescing color completely
without effecting on the visual appearance.
pH Inks can be printed utilizing Silkscreen, Flexographic or
Rotogravure printing methods. These
inks are produced in Ultraviolet Curable Varnish, as well as
Invisible pH Inks are available in Yellow, Green and Blue.
Invisible pH Inks are packaged in 1-gallon and 5-gallon containers.