I am doing it from memory so I may skip a step or two but it went like this.
1) prime white
2) wash with Asurmen blue, leaving most of the claws unpainted. wait till dries
3) wash claws with Baal red partially overlapping with blue portion, wait till it dries
4) wash with Asurmen blue all over including claws, wait till it dries
5) Drybrush red portion of claws with blood red
6 wash claws again with baal red
Done. Whole thing took about 30 minutes. For a table top army it could be fielded as is (after basing) and most likely it will look better then ~70% of demonets out there.