UV light resistance of digital inks
Ever wondered what is the UV light resistance of digital inks?
The lightfast properties of printing inks are the amount of resistance to fade or color change of a printed surface when exposed to daylight (or an artificial light source) over a set period of time.
Prolonged exposure to daylight is only one of many reasons for color fade. A lightfastness rating is given as an ink property that can be quantified under a narrow set of parameters in a lab. If exposed to outside conditions, colour fade results would vary considerably from the original lightfastness rating based on the weather ability parameters of the exposed sample. The same printed surface could also react to chemical attack from solvents that come into contact with the print with lacquers, varnishes, lamination adhesives or even leaching of chemicals.
Also, the energy output varies considerably depending on the seasons of the year. Latitude, altitude, location and time of the year have an enormous effect on the levels of color fading. The Blue Wool Scale is by far the most popular method of measuring lightfastness and is rated between 1–8. 1 being very poor and 8 being excellent lightfastness.