Air-Ink Markers

Air-Ink Markers

The ink in this marker is made from car exhaust. Photo: Air-Ink

Scientists from MIT have developed a filter that turns soot into ink. It attaches to the tailpipe of a car or diesel generator to collect the exhaust, which is then filtered and turned into the ink that fills these markers (starting at $35). About 45 minutes of exhaust will produce one ounce of ink. The markers come in various sizes, with tips ranging from two to 50 millimeters. 

Buy Now

Subscribe to Outside

Outside Magazine Latest Issue

Save 72% and Get the Special Women's Issue!