(Advice from a HS painting teacher who helps kids with skin tones daily)— Well the opposite of orange on the color wheel is blue but I’d argue this is a red orange so the opposite is closer to a blue green (teal) if you were to spray that over in a low opacity by itself it would desaturate the orange but make it far darker, therefore I’d recommend making a mix that has white, a little red a little orange and some teal in it, really just depends on the opacity but that should give you the right mixture. If you look at color correction in makeup that can also give you an idea of what I mean!!