Generally, you would need to lighten/bleach your hair first for the pink to show up.
If you want a dark pink (sort of red/fuschia that fades down through many shades of pink over washings), I've found that L'Oreal Colour Rays in Fuschia Flash actually works pretty well as a one-step color. (You mix the pigment into a developer--both provided in the kit--and it lightens and deposits color at the same time.) It's pretty thick, and is technically meant to be brushed on as highlights, but if you have short hair, it's pretty easy to coat all of your hair with it.
I just did this again a few nights ago. As a frame of reference my hair is naturally dark, dark, dark brown almost black and is currently about 2" long over most of my head and then a bit longer through one section at the top and front. When I was using the bleach then dye method, I bleached with Herbal Essences XL0 and then dyed with a variety of pink dyes (depending on what shade I wanted) from a beauty supply shop (like Sally's).




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