What are these markings on the A380 wing? There are some &quot;markings&quot; over the wings and the horizontal stabilizer. Could somebody explain what they are?
The darker areas denote where it is safe to step. Stepping outside of these areas could cause damage to the aircraft.

Here's a closeup of the warning:


(This happens to be a photo of Qantas Flight 32 after its un-contained engine failure)