This iris was done using a technique made famous by Cheng Khee Chee and Roland Roycroft. I wet my paper thoroughly, and dropped in some blues, greens and purples, and while it was still wet I used a "thirsty" brush to wipe out the white iris. Of course, it didn't come out pure white, but that was okay - in fact, my reference was a pale blue iris. When everything dried, I added some shadows and the yellow beards. It's an interesting technique, and I felt that I really struggled with it, but I like the effect.