"White 05" undergoing engine testing at Bad Zwischenahn. This time the mottling appears to very light. It has a new 'thingie' on the rear fuselage, close to the exhaust. What's interesting here is the contrast between the black in the Balkenkreuz and the camouflage colors. This picture shows the unexplained "C1" left of the Balkenkreuz.
Source: "Messerschmitt Komet - Entwicklung und Einsatz des ersten Raketenjaegers" by Jeffrey Ethell