Excel User Defined Function: change the cell's color

Question

I have a user defined function in Excel. It is called as a formula function from spreadsheet cells and works fine.

I\'d like the function to be able to change the ce

Answer 1

This cannot be done. User defined functions cannot change the state of the workbook/worksheet etc.

Use Conditional Formatting to achieve what you are trying.

EDIT: This is more of a suggestion, not a real answer.