Prismacolors come in a huge variety of colors. I'm sure someone out there has had the idea of purchasing all light colored materials and coloring them with these inks.So far I've used them very successfully with thread, floss, and antron. I'm a beginner and I think this might be a great way to save money. A single spool of white thread, a single hackle skin of wight feather, a single white biot, hurls bleached white, ...etc . I've never tried hurls or feathers because all I've got is all colored or natural already and the inks don't work so well on these. Before I try to purchase some other light or white materials I like to get some input on this concept. Has anyone tried this? does it work well with feathers? And do you find that the colors hold up well? How does this affect dry fly materials?