It depends on the sea cucumber. Some varieties of sea cucumber are black when they are alive, and some are dark when they are alive, and the color is darker after processing. Some fresh sea cucumbers are covered with a sticky and slippery surface, which will turn black when heated during processing.

Below, these are fresh naked ginseng (two on the left) and naked ginseng (on the right). The naked ginseng is black.

Below, fresh sea cucumbers are also black.

Next, black jujube ginseng

I don't know, don't say these are all eggplant.