.But research by Motorsport.com has uncovered that while the track looks like it has been painted, what has happened is actually a bitumen surface treatment that is commonly used on roads in the United States and Asia.
Bitumen is applied in fluid form to the track surface to help bind with the surface of the existing circuit. The idea is that it helps eliminate dust, improves waterproofing and also prevent disintegration of the track.
It is understood that this work was done in Shanghai last year, and the varied colouring around the track is the result of this treatment having been worn away from track running that has taken place since.
The manner of the treatment means it will likely further be worn away over the F1 weekend, which could open the door to varied levels of grip around different parts of the track.