DatiMom This is the Coprinus comatus mushroom (also known as the inky mushroom), a relative of the champignon. It's a delicacy, but it must be picked within a day and cooked immediately, otherwise it quickly decomposes and turns into a black liquid. On the other hand, this liquid was once used to make a unique ink. This ink creates a unique pattern that is impossible to counterfeit. For this reason, it was even used to protect important documents.
