That’s fair. How does rosaniline compare with the spectral mix approach? Do you know?
I found this colour wheel :
https://i.pinimg.com/originals/48/bc/72/48bc72c32dfb9274c898d2ae94a5e1aa.png
which includes a tone called “aniline” which could be it. It can’t mean actual aniline as that is colourless, so I guess it refers to an aniline dye. Magenta is shown as being a bit redder. Amethyst is also shown.
P.S. in fact “aniline” on that colour wheel might instead refer to Perkin’s original aniline dye, which became known as mauveine, I think. Rosaniline seems to be a bit pinker, so indeed more magenta-like.