Hair is a faded violet pink over a bleached base. Formerly Purple Rain by the brand Artic Fox. I want to go dark brown without going super dark or black, and I don't want plummy or reddish undertones. Can anyone recommend a good demi or semi permanent brown that isn't too reddish and will keep the purple from peaking through but also won't turn murky or green?
Purple Rain is pink based and shouldn't go green on you. So there's a plus. But the pink might show through anything thats not red based.
Based on the provided information would suggest an dark ash brown or a dark brown. If the hair is a pale pink or light pink the dark ash brown or dark brown should cover. Suggest dark brown ash because indicated do not want plummy or reddish undertones. Ash tones are green based and green is the opposite of red on the color wheel. The greenish tones from ash would help to neutralize the reddish tones within the pink. Dark brown and black are very close to each other so it will be tricky.
Strongly suggest a strand test on a very small section of hair with the product to be used to cover over the violet pink.
These are my suggestions and opinion.