This is a fun technique that I've done before. Thinking of using it for my "B" technique ATC swap. On one sheet of 8-1/2" x 11" coated paper, used a mixture of 3 blues, 2 are dye inks and 1 Dr. Ph. Martin Iridescent Colors. Drops on craft sheet, pick up with brayer and brayer on to paper.
These colors blended together very well.
On another sheet used 3 different Dr. Ph. Martin Iridescent colors.
Light, but fun.
Next sheet of paper, used 3 different colors of dye inks.
This is one of those techniques that will look different every time you do it. Not sure which one I'll use.