Modifying Pen Colors in Second Series of Time Series Chart

I have a time series chart that has two different series displayed on it.

Currently the first data point in each series is the same color (matching the style set for the chart).

How do I modify an individual pen to change its color, or alternatively, is it possible to adjust the style so the second series shows up with different colors?

For example, if you have plots.0.trends.0 and plots.0.trends.1 then try,
plots.0.trends.0.columns.0.color : blue
plots.0.trends.1.columns.0.color : red

You might need to make sure that you have specified the key (the Y-value from the series property) just above the color property.