So In my last post I posted a few pictures of a water-damaged megilah, the few responses I got indicated that it is Kosher and/or I can scratch out/erase the "halo" around the Ayin (and few other letters). Here are the questions:
1. Doesn't the klaf need to be white? Isn't the Ayin of Odam now on a non-white background?
2. Why isn't erasing the coloration chok tachus (is there a level of blackness that it needs to be before scratching is not chok tachus).
For my own learning (I am a student/beginner), I would appreciate marei mekomos for any opinions expressed.
Here are the pics again: