This is in-camera selective colour, with a tad of in-camera exposure compensation adjustment.
I am thrilled how this turned out.
I bet there is some purple in there.
@ludwigsdiana I use this sooc challenge to explore my camera. I have mixed feelings: it feels like cheating because in a film camera there aren't this many options. But on the other hand, I paid for these, so why not use them?
@shutterbug49 My son pointed that to me as well. I was so concentrated on the violet and purple. He said that the white center looks like being lit from behind.