OnePlus 6 prototypes confirm OnePlus tested a wide range of gradient finishes11
As the OnePlus 6T isn’t yet official, the YouTuber in question wasn’t allowed to show off the smartphone in his video. However, he was given an extensive tour of OnePlus’ headquarters and was also shown a number of old OnePlus 6 Prototypes. Ultimately, the company chose to release the OnePlus 6 in Midnight Black and Mirror Black – a limited number of devices in Flame Red and Silk White were also sold – but it turns out OnePlus actually tested a wide range of finishes. These covered everything from blue and purple to a huge number of gradient options that look quite unique.
Considering the popularity of the Huawei P20 Pro’s Twilight finish, it’s unclear exactly why OnePlus chose to skip the gradient finishes it looked into. However, it's highly likely that the very limited profit margin the brand operates forced it to choose the colors that it knew would sell in high quantities.