Go to the Rodbuilding.org Library page and find the article "
Narrow Trim Bands and Thread Inlays" by Tom Kirkman. The narrow trim band wrap will easily fall apart after final trimming. I give my guide wraps a first coat of finish, then add the trim wraps. I give the trim wraps a coat of finish before I trim the tag ends.
Another technique is use a Sharpie marker to color the thread for the requisite length. You will have to experiment to find a marker color that doesn't wick into the other threads or run from the rod finish.
Be aware transparent wraps take lots of practice and experimenting to get them right. As casually mentioned in the link that
neuralize gave, the wraps are likely to look different under different lighting.
Tom