Burn the whole sidewalk. That way there wouldn't be any difference :D
Lol
Just use white-out.
Uhhh, put a huge pile of dirt on it, then say the dirt stained it?
Burning is a chemical process and is therefore very difficult (or more often impossible).Your best option is to grow a sack and just own up to it. If not, your screwed. Only option is to remove that portion of the concrete either through sanding or chipping, either of which will just make it more noticeable.
