Is the message blue or black?

The message is blue, not black, because you and the other party both use iPhone and both have iMessage turned on at the same time. The system will give priority to this function, so the content is dark blue. Short message: ShortMessageService (SMS for short) is a text or digital message directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive short messages at a time is 160 English or numeric characters, or 70 Chinese characters.

That's not true. The other party blacked you out, and the message has no color, but you can't. He knocked you out.