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Gets or sets the tint and shade adjustment applied to this color.
A value of 0.0 indicates no adjustment, negative values darken the color,
and positive values lighten the color.
double TintAndShade { get; set; }
Property TintAndShade As Double
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 40, 40, 100, 60);
shape.Fill.Solid();
shape.Fill.Color.ObjectThemeColor = ThemeColor.Accent2;
double tintAndShade = shape.Fill.Color.TintAndShade;