Like Gina said, but I have more to add. I actually went out and bought AND READ 2 books written for cosmetology students all about how to color hair. Corrective color, bleaching, toner, peroxide- everything was explained.
One thing that surprised me greatly was that temporary, "semi" permanent, or by other names, color damages your hair more than permanent color with ammonia and peroxide developer. The reason involves the cuticle, color molecules, and timing.
Like Gina said, choose a cooler tone, even a neutral tone if you chose a gold/warm/red one before. Red fades quickly, but that orange look is very difficult to live with.
HTH
Connie
Edited to add:
I use Loreal Excellence because it is a gel rather than a liquid. I use it only on my roots, and it doesn't run all over like a liquid does. Liquids are all right for the initial color, but not for roots only.
The gel (cream) stays put. Then my hair is less damaged due to minimum exposure to the color.
-C.