I have been wearing for over 10 years and purchased from many different vendors. None of them had well bleached knots other than the front area. So for whatever reason, I guess it is not possible to do so. I will say that Toplace units have the best bleached knots in the front - almost no knots visible. It would be great if all the knots are like that, and not just in the front.

Now I am thinking the reason why the knots are invisible just in the front is because hair is ventilated differently.