Change a color of a cell from one cell in sheet2 when making reference to it in sheet1

Question

I'm trying to change the color of a cell in one sheet when made a reference in another sheet.

Sheet2 is a list of addresses and I want these to turn red when I use them in the main sheet on sheet1. I have tried conditional formatting but I cannot get it to work with the options that are available.

Does anybody know how I can do this?

Answer 1

The formula in conditional formatting can't refer directly to cell/s in a different sheet. However if you give the range in Sheet1 a Workbook name this can be used. Then something like

=MATCH(A1,Used,0)  

with formatting of your choice should suit ('Used' here is the named range).