Changing an Excel cell's backcolor using hex results in Excel displaying completely different color in the spreadsheet

Question

So I am setting an Excel cell\'s Interior Color to a certain value, like below:

worksheet.Cells[1, 1].Interior.Color = 0xF1DCDB;

However, when

Answer 1

The RGB colour alone can be parsed from an HTML hex string:

Color colour = ColorTranslator.FromHtml("#E7EFF2");

If you have a separate alpha value you can then apply this (docs):

Color colour = ColorTranslator.FromHtml("#E7EFF2");
Color transparent = Color.FromArgb(128, colour);