Indian engineers convert soot from diesel fumes into ink

02:40

02:44

02:14

02:14

01:39

02:09

01:19

01:34

03:07

01:19

01:51

03:13

01:44

02:04

01:53

01:25

01:13

01:05

01:54

01:21

01:50

01:15

01:44

01:31

01:07

01:27

01:13

01:14

00:51

01:15

01:24

01:27

01:20

01:51

01:30

01:36

02:12

04:24

01:29

02:14

01:29

02:06

01:21

02:23

01:01

00:58

03:28

02:49

01:37

02:07

00:59

00:39

01:30

00:58

00:54

02:27

01:39

01:02

01:46

01:09

01:36

01:34

01:58

02:07

01:35

01:53

01:04

01:08

01:17

02:01

01:37

01:12

02:31

02:20

03:14