Might you mean using the marker to
color the thread so you don't need to
carry many different spools of different thread colors?

Some tyers use only white thread with
various waterproof color markers.

Kinda nice if you change thread color
while tying the same fly.

Sorry if I am second guessing here!
Just dose not sound like it would
work very well for dubbing.

[This message has been edited by Steve Molcsan (edited 01 March 2005).]