That is the historic "rule of thumb" when it comes to muskie fishing but totally dependent on the water you are fishing. Many lakes go through a change in water clarity throughout the season requiring us to adjust our color choices accordingly - for example when an algae bloom starts to appear. Try to experiment with a number of different colors until contact has been made - fine tune as you fish.
Fish hard!
Chas Martin
http://www.muskymastery.com