Thanks ladies, it is not a preprinted panel. I put the blue lines on with a water soluable blue pen.. I contacted the company that sold me the blue line eraser and he told me to use it full strenth on the spot instead of spritzing it.. I used a Q tip and dabbed it then let it dry, it took about 10 times but it finally came out... I do now remember reading on here at one time club soda worked on stubborn stains... The company thought that possible the fabric had come into contact with something that make the blue hard to remove.. I am now leery of using the blue marking pens.... This was a white whole cloth quilt for a wedding gift that a lady had commissioned me to make. I was sick, but all turned out well. Again thanks for all your help.