Artist Maria Katkova and ink made from the inky cap mushroom
I came across an account by the artist Maria Katkova of how she once made several works using mushroom ink. What is that, you ask? The artist explains the recipe: if you pick an ink cap (a dung-loving one, to be precise), place it on a saucer and watch, you may witness the phenomenon of autolysis, the self-digestion of the fungus's body into a black liquid. This liquid is sometimes used as ink, and under magnification the traces it leaves on paper reveal a unique pattern of spores. In short, do bear it in mind, should you ever find yourself in some uninhabited spot without a ballpoint pen