Like many other rainbow chalices the rainbow crush will grow in many different colors and intensities-The exact color scheme can vary greatly from frag to frag. just depending on the predominant color of the frag will determine what the majority color of the chalice will be, say you buy a 2 eye rainbow crush that's all red-well eventually the other colors will pop up into play, but once the chalice is much bigger! This is why chalices can be so hard to "confirm"
Hope this helps
Thanks, Luke