Lignin Extraction (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption This image shows lignin extraction with (left) and without formaldehyde (right). Credit Alain Herzog/EPFL Usage Restrictions For non-commercial purposes only. Please mention credit. License Licensed 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.