Mix Masters: NIST Scientists Image the Molecular Structure of Polymer Blends (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption Typical BCARS composite image of a polyethylene blend taken at NIST showing circular polarization response. LLD polyethylene shows red in this mode, while the HD polyethylene with deuterium substituted for hydrogen is green. Credit NIST Usage Restrictions None Share Print E-Mail 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.