Reference article
Midnight Black
Midnight Black is a cosmetic colour for the player’s duck.
How to obtain
Win 
Leap of Faith to unlock this colour, then purchase it in the 
Duck Shop for 50 
Coins.
Appearance and use
Colour changes the duck’s appearance without affecting its racing skills.
Version note
Winning Leap of Faith unlocks Midnight Black for purchase in the shop. In the Unity editions, touching lava on a course with a lava hazard changes the duck’s equipped colour to Midnight Black and returns to the home screen. This colour change does not mark Leap of Faith as completed or unlock the shop entry. The lava effect in original Flash is unknown.