Oh. I haven’t read Superman since I was a teen... oh so many years ago. The only one that I knew of was green.
Red Krytonite was in the comic book series as well.
But the other ones, I got from ‘Smallville’.
Superman just keeps ‘evolving’.
Maybe the next one he’ll be too close to the sun and start to ‘melt’.
Hey. Don’t laugh. Rosie says it’s impossible for steel to melt so if Superman gets to close and does, then it will prove her even more wrong!
:0)
Well, we have designer Kryptonite, now....