Kristen E$ss hair gloss in bittersweet?

I have naturally darkish brown hair (level 5 approximately) and I have been wanting to go darker for the winter. I cant find any cool toned dark brown glosses but I saw that the bittersweet shade from kristen ess neutralizes brassiness. i have old highlights at the end of my hair that look more orange. i was wondering if anyone has had any experience with this dye? does it fade out warm? idk if its helpful but i have long, low porosity, 2b/2c hair.