Farbrum

Farbrum is a fictional material described in science fiction and thought experiments about advanced materials. It is depicted as a color-changing, energy-storing pigment with exceptional optical and electronic properties. In real science, farbrum does not exist.

The term is a constructed name, likely drawn from German Farb- meaning color, with the suffix -um common to elements and minerals.

In fictional depictions, farbrum exhibits tunable photoluminescence, a very high refractive index, and a wide band gap. It is described as chemically stable, resistant to oxidation, and able to reversibly shift color under electric or magnetic fields. No real measurements exist.

In stories, farbrum is said to occur in trace amounts in meteorites or in deep underground veins formed under extreme pressures, or to be synthesizable through speculative "quanta-annealing" processes. It is often portrayed as rare and valuable.

Within fiction, farbrum is used in advanced display technologies, adaptive camouflage, or energy storage devices, and as a subject of artistic pigments. It serves as a narrative device to explore material limits and color theory. It is sometimes cited in discussions about how new materials might transform optics, without implying real-world existence.