Black printing ink is one of the most consumed products in the industry. Most of this printing ink is produced in factories with complex chemical procedures. Companies like HP/Canon make 70 percent of their profits by selling these cartridges at 400% margin.
Just a minor itch that led me to build something cool from observations arising from nostalgia of the days back in India. There's so much soot/pollution around us, esp. in crowded cities. What if the same could be repurposed to generate ink for printers?
Rubbing alcohol+oil substrate+soot= lowtech non-uniform ink . We built a contraption that supplies the ink to HP C6602 inkjet cartridge interfaced with Arduino turning it into ~ 100dpi print platform.