The Color Each property is used to set the color of each value in the series (depending on the selected style). By default, the Color Each property is set to false and the columns in one row have the same color. Below is an example of a chart with two series with the Color Each property set to false.

When the Color Each property is set to true, each value on the x-axis will have its own color. Below is an example of a chart with two series with the Color Each property set to true.