In the past, F1 teams have often taken the opportunity to run their cars in special or raw liveries during pre-season testing.
From McLaren to Red Bull, Force India, Williams or Ligier, Arrows and Renault, many outfits introduced new ideas or interim schemes, some of which looked even better than the final version.
Just a few weeks before everyone pulls the covers off their 2018 chargers, we've delved into the archives and put together a selection of pictures of some rare liveries.
