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Gets or sets a value that lightens or darkens a color.
The valid number is from -1 (darkest) to 1 (lightest). Zero (0) is neutral.
double TintAndShade { get; set; }
Property TintAndShade As Double
IRange cell = worksheet.Range["A1"];
cell.Interior.ThemeColor = ThemeColor.Accent1;
cell.Interior.TintAndShade = 0.5;
double tintAndShade = cell.Interior.TintAndShade;