Massachusetts Institute of Technology engineers from the "black mark made by hometown air on the clothings" inspiration， founded the Gravity Laboratories （Graviky Labs）， and released their latest research results made of drawing products - air ink， which is The world's first ink produced by refining the coal components that pollute the air.
　　It is reported that the Gravity Labs has developed a cinder particle collector， which is a metal pipe， can be installed in motorcycles， cars， aircraft and other exhaust emissions. After collecting the black slag powder， it will remove the harmful metal substances and dust， leaving the carbon-rich particles， grinding it into ultra-fine powder， combined with solvents and oil to meet the different needs of the ink. A diesel engine in 40 minutes in the discharge of polluted air， can be made into ink that can be used by a 2mm oily pen， which according to the artist is more mellow.