<p>This probably sounds really stupid, but I'm worried about my eraser marks. They didn't completely erase. I also meant to omit a problem, but then accidentally filled it in and then realized and erased it later. How do the scanners work/does it only detect the bubble as filled in if it's really dark?</p>
<p>your fine unless it was really dark.</p>
<p>it went through so i got the question wrong!! aghh</p>