URGENT. what colors to mix to create mustard yellow

[Themonstermash]

I'll be coloring my hair tomorrow after a final vitamin c mask, and I'm not sure about color mixture. I use punky color, so it's either mostly yellow, some orangey red, some purple and maybe a touch of black? Or just orange and yellow? Or just orange and purple, or red and blue and yellow added to more yellow???  I've wanted this color for a LONG time and I've achieved a pretty light and almost uniform color for a base, it would be a shame to screw it up at this stage

[Janineb]

Going back to mixing paint colours in school, I'm 99% sure we used to add red, black and a little green for mustard. Try and find a golden based yellow too, too acidic and it probably won't be nice.

[Themonstermash]

Finished result

[Janineb]

Looks great! What mix did you go with in the end, for future reference?