[Help] Memory Magick

[Razzmatazz]

I was doing some reading and came across a reference to memory charms; I'm still digging, but I haven't found anything quite yet. I was wondering if anyone had any good sources or advice for spells to enchant the memories and perceptions of others? I've been able to affect people's general perception of me and affect their immediate emotional state, but I haven't really taken a crack at say, making them forget something that happened or remember something that didn't, assuaging suspicion or the like. Any help would be much appreciated.