Idioms with COLORS

in the black
making a profit; without debt
The company is finally in the black.

in black and white
in writing
We need to see the proof in black and white.

in the red
operating at a loss; being in debt
The company has been in the red for the last two quarters.

out of the blue
unexpectedly; without warning
Symptoms of the disease often appear out of the blue.

green with envy
very jealous
His success made them green with envy.