The Color function will return the relevant RGB value based on the current palette - so you're actually limited to 20, then they will start to repeat. So Color(21) will be the same as Color(1). When you have a large number of brands that you need to distinguish between you're better setting distinct values in the script and using ApplyMap to set the value - http://community.qlik.com/blogs/qlikviewdesignblog/2012/12/04/colors-in-charts
With over 200 brands is it necessary to specify different colors - colors in charts should always have a meaning so consider what the purpose of the colors are in your chart.
