I have blonde hair, Its from low levels of the dark pigment eumelanin.
Really I have brown hair and never understood how the coloring is determine
Well hue depends on various factors, but always has some sort of yellowish color.
That is interesting, what else can you tell me about it I have always wanted to understand it?
Well they use a scale to range hair color its called the Fischer–Saller scale
And what does the scale determine?
The ranges of the hairs color,  The word "blond" is first documented in English in 1481