Varnish is poorly cured on black ink, white ink, and blue ink layer
Printing varnish on black, white and polished blue inks presents many headaches. The photoinitiator of the pigment and varnish in the ink absorbs the ultraviolet light of the same wavelength band, and the two compete for the limited ultraviolet light energy, which has a greater influence on the varnish, which may cause the varnish to be incompletely cured. Solution: Increase the power of the UV lamp, clean the reflector, replace the UV lamp, reduce the printing speed of the varnish. In the long run, develop a versatile varnish that can be completely cured on any color ink layer.