Add one more default line color
Making the default set of line colors not be a multiple of the default set of symbols would make it easier to distinguish more lines on a chart. At the moment red lines always have triangle symbols. By adding one more color each time the first color was reused it would be on a different symbol.
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Alan Hinton
shared this idea
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You can set any number of colors: http://jsfiddle.net/highcharts/rj8efe0j/