3D printing solid polymers in salt water (VIDEO) University of California - San Diego This video is under embargo. Please login to access this video. Caption Three different PNIPAM polymer inks being extruded into a salt water solution: plain PNIPAM (white), PNIPAM mixed with food coloring (red), and PNIPAM mixed with carbon nanotubes (black). Credit Donghwan Ji Usage Restrictions Please credit: Donghwan Ji License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.