If I understand correctly you would like to avoid the colors mixing where the series overlap? This can be achieved as set seriesDefaults.opacity
option to 1
In case I am missing something please elaborate a bit more on the exact outcome you would like to achieve - this way I would be able to advice you further and provide concrete recommendations.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.