Try something like the following:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Target.Address = "$C$3" Then
Target.Font.ColorIndex = 1
Else
Range("$C$3").Font.ColorIndex = 15
End If
End Sub

Put this code in the sheet module for the appropriate sheet.
Change $C$3 to the cell in question and change the 15 to the
correct colorindex value.


--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com



"Hotbird" wrote in message
...
I am wondering if it would be possible to implement a feature,
whereby a
cell which contains information hidden as grey text on a grey
background,
could automatically change to black on grey in response to mouse
movement
over the cell in question. There do not seem to be standard
spreadsheet
events to trigger the 2 necessary macros.