Hydrazone Photo Masks (IMAGE) Dartmouth College Caption Filter papers covered with photo masks irradiated with a blue laser pointer demonstrate activation of hydrazone switches in solid state. Monitoring under 365 nm light revealed the images of (a) the Statue of Liberty, (b) the Pisa Tower, and (c) the Great Wall of China. Photos courtesy of Aprahamian Research Group/Dartmouth College. Credit Aprahamian Research Group/Dartmouth College. Usage Restrictions Must credit: Aprahamian Research Group/Dartmouth College. 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.