Yes.It will be harder to achieve the super bright colours but you can still get great results on dark hair.
My tip is to spray dry shampoo on the ends of your hair before applying the chalk. Or use a white chalk first, then add colour over the top.You can also wet your hair and the chalk to help the colour stay.
2.WILL HAIR CHALK STAIN BLONDE HAIR?
It can do, but it will still wash out.
If you hair is coloured blonde, it’s more porous and will take the colour easily.
Do not wet blonde hair when applying hair chalk. Unless of course, you want the colour to stay on for a long time.