Look for dark and negative themes, maybe with a lot of violence or inappropriate content. Also, check the art style if it's too gloomy or disturbing.
You can tell if a comic is black by seeing if it goes against moral and ethical standards. Check if it depicts harmful or illegal activities in a positive light. Also, notice if the language used is vulgar or offensive. These aspects can help you spot black comics.
To spot black comics, pay attention to the storylines. If they promote harmful or illegal behavior, that could be a sign. Also, the characters' actions and values can give clues. Sometimes, the overall tone and messaging of the comic can indicate if it's black.