Nancy, it was mostly used in "imaginary" stories, but it is a part of the silver age of comics and well known to us older comics readers that GOLD K would permanetly remove the Super-powers of anyone from Krypton. I believe Superman used it against some of the criminals that were banished to the Phantom Zone by his father, Jor-El.
Tank would probably be able to give you more info!
Hey yellow is a different color than gold!!
