What are bleached knots?

Here are some pictures showing bleached knots of our hair systems. The first picture shows an

example of standard bleached knots on a colour #3 Dark Brown unit; while the second picture

shows an example of extreme bleached knots on a colour #1 Jet Black unit; and the third picture

shows an example of extreme bleached knots on a colour #5 Medium Brown unit.

Here is a picture showing the difference between unbleached knots and bleached knots on a

colour #1B Off Black unit.