Magic black: Air-Ink, the artists' supplies made from vehicle pollution.

Inventor Anirudh Sharma is capturing carbon from car exhausts to turn it into ink.
Read more: https://www.theguardian.com/artanddesign/2017/apr/06/carbon-air-ink-pollution-vehicle-emissions-anirudh-sharma-graviky-labs-london-black-cabs?source=Snapzu