"Clearing mines" (in black) and "Clearing mines" (in orange)

[P.Ako]

I think he is talking about the color of the text on the engineer unit's portrait when it is sitting in the minefield. Mike is correct in what the colors stand for, but the end result means that Orange Text means that the engineer unit is assigned to clear the minefield, but cannot do so on this turn because it either just moved into it, or it is disrupted. If the text is black, then that means it WILL reduce the minefield at the start of the next turn provided that the enemy does not disrupt it on his turn.

So, basically Orange text means that no minefield reduction will occur from that unit by the next turn.

Ok, you understood me perfectly. Thanks