using temporary colours is one, coloured sprays and mousses, which help the hair change colour, try food coloring
If hair is colored with Temporary hair color, it will completely wash out with shampoo. If hair is colored with a Semi-Permanent color, the color will gradually fade with each shampoo, exposing the hair's natural color.
Any colour you can always dye your hair. So if thats what your asking thats your answer unless you mean colours we are all born with . anthing natural like browns, blonde, orange (ginger) and brown (brunette.
ginger is the rarest natural hair colour in celebrities
No, red isn't a natural hair colour. You might have ginger or orange hair that's really dark and you might think it is red. It isn't a natural colour at all!
Genetics
no
His natural hair colour is black, which i know because im pictures you can see that he had his hair colour changed to blonde
Schwarzkopf is a popular brand for temporary hair colouring. Their website also offers information about temporary colour and how long they last and also the effect it has on the hair.
The color of your hair that you are born with
She has blonde hair
explain how natural hair pigmentation affects colour