It's a problem for many modellers - to imitate muzzle burn on the weapons. They appear is the barrel gets really hot - for example, on machine gun, or on flamer. Such rainbow looks realistic and it's really better than plain soot. But how to imitate it? There are a lot of guides which suggest airbrush for it. But not everyone has an airbrush. For those who want it simple we have a really easy tutorial with Citadel washes.