Citadel Layer paints are high quality acrylic paints.
They are designed to be used straight over Citadel Base paints (and each other) without any mixing. By using several layers you can create a rich, natural finish on your models that looks fantastic on the battlefield.
This is a good purple, I rarely use purple but this got the job done with capes and skin tones.
Citadel Layer: Genestealer Purple