Bounty Colors

There are multiple bounty colors, each representing different levels of money and thus the difficulty of each person they are trying to catch. 
White = Thousand Credit Plus Bounty 
Green = Ten Thousand Plus Credit Bounty
Yellow = Hundred Thousand Plus Credit Bounty
Red = Million Credit Plus Bounty
Black = Billion Credit Plus Credit Bounty
The phrases "going white" meaning to become a bounty target and "going black" to mean becoming one of the most notorious bounty targets have become popular phrases in culture.