Do you have an official document which says what colour your hair is? A driver's licence, or a passport, maybe?
If so... does it report your hair colour accurately?
My driver's licence claimed that my hair was brown for at least a decade after it wasn't brown any more. And even in the last century my mother scoffed at that: she said her hair colour was "Lady Clairol 101". (I don't know what her passport said.) Nowadays people sometimes change their hair colour from month to month, so what's the point?
I don't ever recall having an ID that states what my hair color is.
On the other hand, my birth certificate states my skin colour. I was born in South Africa near the tail end of the Apartheid. The interesting thing is that it kind of looks like a multiple choice form where your ethnicity is ticked off, so you can see the other 'options'. I recall that one of them was "Kaapse Kleurling", which means as much as "Colored from the Cape". That seemed oddly specific and pointless to me, but then, the whole thing is pointless to start with.
Back to hair colour. I painted my hair a bright red once. I wonder if I can find pictures of that somewhere.