Keep me posted as well. I have had purple eggs AND the plum eggs that you have mentioned. I had fun making a timelapse of two purple eggs a while ago. One was wet and the timelapse just showed it drying into the same color.
Myth: Ayam Cemanis lay black eggs
True/False: False
Origin: Saw this online somewhere. I think people assume they lay black eggs because they are an "all-black" chicken.
Myth: You can't eat fertile eggs!
Whereabouts: Not sure where people heard of this, I always assumed it was superstition, but maybe not.
True/false: False
Myth: If you butcher a chicken within eye-view of another chicken, they will become aggressive
Wherabouts: I read it somewhere on BYC (I believe there was a discussion on it)
True/false: False