Red Bull has dropped the RB11's 'camouflage' test livery.
Throughout the winter, the 2015 car has been running in a novel black and white colour scheme designed to throw rival teams' spy photographers and designers off track.
But the livery also proved highly popular among the fans, prompting calls for Red Bull to use it at the grands prix too.
"It's not the first alternative livery we've used and doubtless it won't be the last," the team said on Monday.
"But we've made our mark in the last ten years in dark blue, and in dark blue we'll remain," Red Bull added, revealing photos on Twitter of the race-spec livery, along with the hashtag 'Back in colour'.
"Those are the racing colours in which we've achieved great things," the team said. "We're not the most traditional of F1 teams, but like the rest of the sport, we value heritage."
Although the final winter test ended on Sunday, Red Bull is running the newly-liveried RB11 at Barcelona on Monday, for filming purposes.