Key Man (OP): “I spent Shabbos with a family and they have (in my humble opinion) the strangest color system in their kitchen for marking milchig and fleishig. Blue – fleishig. Red – milchig
What colors do you use?
What about Parave?”
Wolf: “Whenever anyone says that any minhag or such is “universal,” it usually isn’t.”
heck, the OP proves it isn’t!