Image 2 (IMAGE) Nanyang Technological University Caption A step-by-step depiction (from top to bottom) on how chicken feathers are washed and ground into keratin powder, and the packaging materials, which they would be used to manufacture. Credit NTU Singapore Usage Restrictions No restrictions. License Public Domain 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.