My son loves the colour so much, yeah he wants to show it. :D
It is only for temporary hair colour, it can be wash off with shampoo. I am not alone using the coloured chalk for hair, my sister-in-law too have the coloured chalk for hair but she wet her hair to do it and the result is much better! :D
It is recommended to use them on wet hair not the dry hair.
Picture above of my son and I tried the product on dry hair.