If what you are asking is how to print your spreadsheet with no indication of
alteration whatsoever, you might prefer follow these steps instead:
1. Use the Drawing toolbar to create a rectangle covering the cell's border.
2. Format the rectangle so the line is brightly colored but there is no fill.
3. Finally, format the rectangle so it does not print - from the Format
Cells dialog box, click on the Properties tab and uncheck the "Print object"
checkbox.
I have used this method successfully. I have also used brightly colored
arrows to point to a cell,similarly formatted not to print.
Another idea is to indeed have fill on that rectangle, but set it to be
partially transparent. This option can be found when you click on "More
colors" from the place where you choose the fill color for your rectangle.
Best of luck.