Tab.TintAndShade Property (Excel)
Returns or sets a Single that lightens or darkens a color.
expression A variable that represents a Tab object.
You can enter a number from -1 (darkest) to 1 (lightest) for the TintAndShade property. Zero (0) is neutral.
Attempting to set this property to a value less than -1 or more than 1, is not recommended. Excel will correct the value internally to some value that falls with the range of valid values. This property works for both theme colors and nontheme colors.