The consensus color of all layers in the symbol (excluding those that are color-locked). A MultilayerSymbol may have many symbol layers. This property represents the value of all color and tint color properties of constituent symbol layers, excluding any StrokeSymbolLayer in a MultilayerPolygonSymbol, as those symbol layers are outlines. The property defines the color and tint color of symbols contained in VectorMarkerSymbolElement. Constituent symbol layers whose colorLocked property is true do not change color as a result of this function. To change outline colors, modify the outline symbol layer colors individually.