2.1.655 Part 1 Section 18.3.1.87, sheetView (Worksheet View)
a. The standard states that the values of the colorId attribute are defined by the XML Schema unsignedInt datatype.
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Office restricts the colorId attribute value to an unsignedInt less than or equal to 64.
b. The standard specifies that the @colorId defines the color value for text in row/column headings and gridlines in the view.
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Office uses the @colorId to define the color value only for gridlines in the view.