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Gets or sets the tint and shade value applied to the border color.
The value ranges from -1 (darkest) to 1 (lightest), and 0 is neutral. The default value is 0.
double TintAndShade { get; set; }
Property TintAndShade As Double
IBorder border = worksheet.Range["A1"].Borders[BordersIndex.EdgeBottom];
border.Color = Color.Blue;
border.TintAndShade = 0.5;
double tintAndShade = border.TintAndShade;