Having had some hair added after the unit has shed down I can definitely see the contrast between knots that I THOUGHT were not bleached, and knots that are completely UNBLEACHED. That said, most of my pieces need additional bleaching in key areas, and when the unit sheds down it can be a real problem if the knots are too dark.

I'm not really fanatical about it at all (my full caps all have fairly visible knots at the crown as we speak) but I'm seriously considering on future orders getting #22 blonde like Debbie mentioned, but on the ENTIRE piece not just the hairline, then getting some professional strength hair dye and coloring the whole unit myself. That way there is no issue with knots, and I can get crazy and leave some of the hair blonde for highlights.

I've colored a topper with excellent results, but a full cap seems like it would be a bit more challenging. What do you think Deb?