Another distinction of artist-quality markers such as Touch Twin and Copic is that they are primarily marketed to professional artists, illustrators, animators, etc. whose careers depend partially on the quality of their supplies. Both of these brands of markers were marketed and used as such for decades before they became popular in the paper-crafting arena. As professional artist tools, they must meet and maintain high standards of pigment quality, lightfastness, etc... just like someone who is a professional mechanic would have a higher standard for their tool kit than someone who just has tools to tinker with at home.
Dina Kowal Creative ♥ Original Art Prints
If you hear a voice within you say you cannot paint,
then by all means paint, and that voice will be silenced.
Vincent Van Gogh