Substrate (image) Aalto University Share Print E-Mail Caption The sample makes a steel substrate look blue. Behind the hand is a ALD reactor. Credit Mikko Raskinen / Aalto University 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.