Can not change FUEL Color for New HUD

I want to make a new hud.
However, I cannot change the text color of "Fuel" in development mode.
Only white can be selected for dev mode. I want black.

TEXT = Fuel
ScreenPos = 0.257, 0.705
Scale = 1.200, 1.200
Justification = 0 // 0 = left, 1 = right, 2 = center
Colors = 0, 0​

Also, I tried to modify the hud.ini directly, but can't change color in game.
Please tell me how.

 

Is the used Font Texture white?
If yes, try it with a black one.
Colors = 0,0 should normally work.

 

Thank you so much for your advice.
Changing the original color was an eye opener.