Hi Partial,
Glad to hear that you like th unit. The knots are all bleached as much as possible without harming the knots. The darker the hair the longer the bleaching time required. You are #1B which is one step away from the darkest color (#1 which is jet black). Bleaching becomes a fine line. Bleach too little and the knots will be completely visible. Bleach too much and the integrity of the knot is hurt resulting in early shedding. In order to get a unit that accepts color well and provide knots that are invisible I suggest ordering a #22. It's a dull blonde and accepts color well. It is used by our professional stylists that keep this color on hand and dye it on the spot to meet a clients needs.
Regards,
John