There aren't any idioms that mean "black" that I know of. There are plenty of similes, like "black as the ace of spades."
It depends on how you use it. If you mean literal colors, then it's not an idiom. If you say something like "It's all there in black and white," then it's an idiom meaning that something is printed.
black sheep
She sees every situation in black and white although she knows it is wrong.
This is not an idiom. It is comparing one thing to another, so it is a simile. Remember: "AS ___ AS___" means A Simile! It is just saying that something is very black.
siah o sufaid
It means to be very angry.
"A black day" is an idiom in contemporary English that is relatively uncommon but still quite useful. With "black" referring primarily to darkness (of night, of a storm, etc.) when there ought to be light, its basic meaning is simply this: "a bad or difficult day."
In debt. Its antithesis, "in the black," refers to having a balanced budget.
Meaning a very obvious difference between 2 things.
Criticism from someone who is just as bad.
Pitch, as known in the context of the idiom "pitch dark" or "pitch black", is also called bitumen or tar pitch. It is a nearly-solid, very black ooze that comes from petroleum (which in its raw form is also very black).The idiom "pitch black" is a minor rearrangement of the simile "black as pitch" which based on the above definition becomes self-descriptive: very, very black.
The phrase "in the black" means that your accounts are solid and making money. If you are "out of the black," it means that you are no longer financially solid - however, the phrase most often used as the opposite of "in the black" is not "out of the black" but "in the red."