Interesting post because I naturally have lighter brown overtones to my #2-ish dark brown hair, and I despise them one me. They look terrific on others, but less than flattering IMO on my skintone (which is light with cool undertones).
So, I'm always seeking black-depositing rinses, conditioners, henna/indigo, and temporary haircolors to cool off the natural warmth tinging my hair.
But recently, I bought a cheap pack of weave in a 1B/33 (off-black with neutral-reddish highlights) and the color was really attractive on me/against my skin. I have also held straight-up reds (cool ones) against my skin and it looks really good.
But I'm just not ready to let go of my commitment to black. It almost feels sacreligious, like I'd be turning my back on what I need (as opposed to what I want). Weird, eh?