The way the Burn Badges work, they look like dull boring metal when you get one. You weld it to the nose of your starship, and you go sun-diving. The coins are engineered with different challenge ratings, but even a starter coin requires a dive into the corona. Above one-million Kelvin, the dye cells melt open, staining the alloy, and producing those awesome molten colors. So if you see a pilot sporting Burn Badges, you know you're looking at someone who can really carve a well.