It's not perfectly even, but it did enough that if I wanted to dye over it, I could get a pretty even color. There's no toxic smell, zero damage done to my hair and good price.
What is the least damaging way to remove hair color?
But the least damaging way would be starting with shampooing, then moving to a hair dye remover, and then ending with bleaching and toning – all extended over days and alternated with hair treatments.