rated to resist UV fading for decades rather than just holding color for a few years — relevant if the finished piece is going to sit somewhere lit

surface indentation

Despite their apparent dissonance

or methylene chloride

The outer housing is reusable

caran dache chromatics ink refill cartridge Caran d'Ache Chromatics:Magnetic Blue rated to resist UV fadingCaran d'Ache Chromatics "INKredible" collection transforms handwriting into elegant color expression. 12 vibrant colors formulated for unparalleled flow, swift drying, and mesmerizing depth. Incredible color saturation glides effortlessly through fountain pen feeds without clogging. Non toxic, water based ink with highly saturated pigment distribution and smooth flow lubricants. International standard short cartridge size universally fits all standard