Sun Chemical warns of potential photoinitiator shortage. Due to a potential shortage of photoinitiators as reported recently by the European Printing Ink Association (EuPIA), Sun Chemical customers that receive energy curable inks could experience product delivery delays in the future. "Sun Chemical is working hard to safeguard supply and mitigate the potential shortage of photoinitiators by qualifying new grades and developing new sources," said Felipe Mellado, chief marketing officer and board member, Sun Chemical. "We encourage our customers to call their sales representative if they have any questions or concerns."