A stacked chart color scheme refers to the use of colors to represent different data series in a stacked chart. In a stacked chart, data series are layered on top of each other, with each layer representing a different category or segment. Effective color schemes should ensure that the different layers are easily distinguishable, especially when the chart is printed or displayed at a low resolution. Common practices include using different shades of a single color for each layer or a distinct color for each category, with careful consideration given to contrast and color blindness accessibility.