"Invisible" shading (i.e., non-printable?) in table cells?

Don't know what this would be called but in a table that I have, I have
locked certain cells in certain columns that correspond to non-printable
areas of a label template. As the label template doesn't somehow signal
what is printable and what is not, I made the label sheet into a form and
locked the pertinent cells/columns. But to make it visually easier for the
user, wondered if there was a way to shade those cells on the screen but
that wouldn't print out on the labels themselves which, if they did, would
just mean a waste of printer ink.

Is there a way to do this? Tx.