How would you dye dark natural black hair (nappy) with bright colors, like hot pink or blue?

For bright colors, you'd have to go blonde first and then dye it with a bright semi-permanent hair dye like manic panic, fudge, or special effects. If you try to use the dye without lightening the natural color, it's like putting colored plastic wrap against black paper. At best, you'll be able to pick up some subtle highlights when the sun hits it.

The problem with dying your hair blue is that you have to bleach it to darn near white. If you dye it golden blonde and then add blue to it, you may end up with hair that has a slight greenish tint, depending on how yellow the hair is.

If you want to lighten your hair at home, there are at home hair dye box kits for people of color like Hi-Rez by soft sheen-carson. I've never tried their blonde color, but I did use a red shade that came out more vivid then any of the mainstream home dye kits. I think with home hair dye kits marketed towards people of color, they formulate it assuming you're using it on dark brown to black hair.

Of course, there's nothing wrong with getting it professionally bleached either. Just depends on $$$/how comfortable you are dying your own hair/how comfortable you are trusting a stylist to do it right.

And there's always the option of colored extensions.

How would you dye dark natural black hair (nappy) with bright colors, like hot pink or blue?

I would do more of a deep dark blue

How would you dye dark natural black hair (nappy) with bright colors, like hot pink or blue?

I wouldn't go all bright do highlights or just get the tips done.

How would you dye dark natural black hair (nappy) with bright colors, like hot pink or blue?

dye the selected area blonde first so the bright colours have something to absorb onto to make em stand out

How would you dye dark natural black hair (nappy) with bright colors, like hot pink or blue?

You would first have to use bleach to lift out the dark pigments in your hair and then color over it again with the bright color. I would suggest seeing a professional to achieve the best results!