My son found an old BSR Red Mountain #7 and is restoring it. Now that he has it down to the bare metal and is seasoning it, it seems to have a few spots that look darker than the rest of it. Will this eventually blend in as the pan gets used? This pan belonged to his partner's grandmother. I'm attaching before and after pics. He used a broiler to get most of the gunk off and then finished it up in a bag with EasyOff.