Cuttlefish ink is a beautiful natural brown pigment.
You don't smell the slightly fishy odor from the natural sepia ink on the internet.
Sepia being composed mostly of mollusc melanin, has the same color as the principal human skin brown pigment. Our human eye automatically focuses on whatever we are looking at.
Authentic sepia ink is prepared from the dried ink sacs of the common cuttlefish, Sepia officinalis. Being a naturally derived organic colorants, the pigment is usually considered as not lightfast. But that's proved wrong as shown in these tests. Good scientists need to be able to recognize imminent paradigm shifts and pigment smears and adjust hypotheses accordingly.
Cuttlefish ink was traditionally used as a slightly fishy sepia pigment
Anything but sluggish, cuttlefish are the action painting metaphors that art needed. Deeply buried squid ink on paper bolstered by practices that integrate art with humor, have risen to the surface.
What is cuttlefish ink used for? Natural sepia ink for escaping predators if you are a cuttle. Escaping routine for a human with a mandate to elevate edgier voices.
Art is nothing more than the shadow of humanity, I would only worry deeply if I was a mollusc.