There have also been some disagreements over the spelling of blond and blonde, with many people wondering what the difference is. The genetics that control the hair gene are not fully established. However, the two-gene model is unable to offer an explanation about the various different shades in the four main hair colors, nor can it explain why sometimes hair darkens as a person ages. The hair color does not determine the attractiveness of a person or their IQ.
This pigment is considered to be more chemically stable than black eumelanin, but less chemically stable than brown eumelanin. The constant debate about blond vs. Esther required five sessions to get her to her goal.