I would like to correct my statement. The guy who I know who created Grandaddy Purple... his name is Mel. I just talked to him and tried to talk him out of some seeds. He gave all his seeds away when he moved. He said "Get your Grandaddy Purple seeds from Ken's line". So I have to apologize as...
Blue in foliage + fruit is called anthocyanins. It's the same thing in blueberries. We've been growing tomatoes with antho' since at least 2010. It's a reaction to the sun. And antho' is a recessive trait. I haven't done any weed breeding since the mid-late 80's when I crossed a local Indica...
I don't converse with people like you... who call people liars and try to hide it in sarcasm. I've even got a friend who wrote a song that Motley Crue made famous; but you will never hear the story, nor will you hear about my friend who created Grand Daddy Purple.