Light-fast inks – quantifying fade

Colour fade is inevitable, but it is also quantifiable!  It is important to be able to give a value to represent how far colours will fade over time. We specify a minimum of a Blue-Wool-Scale index of 7, and try to use 8 where possible for outdoor labels. A useful article on how the Blue Wool Scale is used:   http://www.epson.com/community/primelabel/wp-content/uploads/sites/7/2014/04/TechInfoLightfastPaper0109.pdf