Try the alcohol based aniline dyes. They aren't as likely to give you a muddied up wood. Since you seem to want to buy pre mixed stuff, Laurel Mountain Forge has a line of these dyes in small cans. I haven't used them on Walnut, but I do use them on hard curly sugar maple for longrifles. The good part is you can layer them repeatedly with different colors until you get the color that suits your taste. Since you want some reddish tones apparently, start with the Nut Brown color and some red tone to go with it. Nut brown may just do it though.