Thank you for all the kind and helpful suggestions. And I'm very sorry about the font and spacing issues. I was trying to find my way around the board when I posted my dilemma and didn't realize what effect some of my choices would have on the final posting.
When I originally put my blocks away, I was very new to quilting and had no idea that the masking tape would leave this residue. Since that time, I have found other methods of marking my blocks. Believe me -- I will never use the masking tape again!