Lower Chakras
Fairy-Godmother posts Mellow Yellow about working on her lower chakras (sacral, solar plexus, and root). She worked on them individually over a few days. Later, during the new moon, she teamed up the three chakra colors (red, orange, yellow) corresponding with these chakras and worked on them as a combination.
I think it is helpful to isolate the individual chakras while working on certain issues. And if a person if very flightly, it is important to focus RED RED RED to give those roots significant depth as well as girth. But, in reality, our chakras naturally bleed into each other. I imagine it may be easier to separate a yolk from the egg white (which can be tricky) than it is to separate the root and sacral chakras, they are so closely connected.