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Gets or sets the tint and shade adjustment applied to the font color.
The value must be from -1.0 to 1.0, where 0 is neutral;
otherwise, an ArgumentException is thrown.
double TintAndShade { get; set; }
Property TintAndShade As Double
IFont font = worksheet.Range["A1"].Font;
font.ThemeColor = ThemeColor.Accent1;
font.TintAndShade = 0.5;
double tintAndShade = font.TintAndShade;