That's a beautiful plant Alain. I love the color and the almost spineless form. I've grown Sulco rauschii several times but never had one that purple. I did have one that was almost black, I liked that one a lot. My big problem over the years with S. rauschii was occasional spider mite infestations. They seem to like these almost spineless plants. Really nice with a little sunshine on it. :)
I have a more green rauschii but have never had one close to black -sounds nice. Good to have a little sunshine after the wettest January on record. Saves on heating costs.
Looks like mine, just a little bit more purple! Beautiful plant!
I have always liked Sulcorebutia rauschii. This is the most purple form I have seen.